CVE-2025-0123
📛 CVE Title
PAN-OS: Information Disclosure Vulnerability in HTTP/2 Packet Captures
Description
A vulnerability in the Palo Alto Networks PAN-OS® software enables unlicensed administrators to view clear-text data captured using the packet capture feature https://docs.paloaltonetworks.com/pan-os/11-0/pan-os-admin/monitoring/take-packet-captures/take-a-custom-packet-capture in decrypted HTTP/2 data streams traversing network interfaces on the firewall. HTTP/1.1 data streams are not impacted. In normal conditions, decrypted packet captures are available to firewall administrators after they obtain and install a free Decryption Port Mirror license. The license requirement ensures that this feature can only be used after approved personnel purposefully activate the license. For more information, review how to configure decryption port mirroring https://docs.paloaltonetworks.com/network-security/decryption/administration/monitoring-decryption/configure-decryption-port-mirroring . The administrator must obtain network access to the management interface (web, SSH, console, or telnet) and successfully authenticate to exploit this issue. Risk of this issue can be greatly reduced by restricting access to the management interface to only trusted administrators and from only internal IP addresses according to our recommended critical deployment guidelines https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-access-of-your-palo/ba-p/464431 . Customer firewall administrators do not have access to the packet capture feature in Cloud NGFW. This feature is available only to authorized Palo Alto Networks personnel permitted to perform troubleshooting. Prisma® Access is not impacted by this vulnerability.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- palo_alto
- CVSS severity
- MEDIUM
- CVSS score
- 5.9 / 10
- CVSS vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:N/SA:N/AU:N/R:A/V:D/RE:M/U:Amber- Effective score
- 5.9 / 10 MEDIUM source: CNA overview
- CWE(s)
-
CWE-312 - Reserved
- 2024-12-20
- Published
- 2025-04-11 17:43 UTC
- Last updated
- 2025-04-11 18:36 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2025/0xxx/CVE-2025-0123.json
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2025-04-11 18:15:38 UTC
- NVD last modified
- 2026-04-15 00:35:42 UTC
- EPSS score
- 0.0004 (probability of exploitation in next 30 days)
- EPSS percentile
- 11.25% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24
NVD / KEV / EPSS data refreshed 2026-05-25 05:59 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2025-10810 - Assigner
- palo_alto
- Published
- Apr 11, 2025, 5:43:05 PM
- Updated
- Apr 11, 2025, 6:36:46 PM
- EUVD base score (CVSS 4.0)
-
5.9 / 10
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:N/SA:N/AU:N/R:A/V:D/RE:M/U:Amber - EUVD-reported EPSS
- 0.0400
- Vendors
- Palo Alto Networks
- Products
-
PAN-OS (10.1.0 <10.1.14-h13)Prisma AccessPAN-OS (11.2.0 <11.2.6)PAN-OS (11.1.0 <11.1.8)PAN-OS (10.2.0 <10.2.15)Cloud NGFW
- Aliases
-
GHSA-379r-vg26-3rr8
ENISA description: A vulnerability in the Palo Alto Networks PAN-OS® software enables unlicensed administrators to view clear-text data captured using the packet capture feature https://docs.paloaltonetworks.com/pan-os/11-0/pan-os-admin/monitoring/take-packet-captures/take-a-custom-packet-capture in decrypted HTTP/2 data streams traversing network interfaces on the firewall. HTTP/1.1 data streams are not impacted. In normal conditions, decrypted packet captures are available to firewall administrators after they obtain and install a free Decryption Port Mirror license. The license requirement ensures that this feature can only be used after approved personnel purposefully activate the license. For more information, review how to configure decryption port mirroring https://docs.paloaltonetworks.com/network-security/decryption/administration/monitoring-decryption/configure-decryption-port-mirroring . The administrator must obtain network access to the management interface (web, SSH, console, or telnet) and successfully authenticate to exploit this issue. Risk of this issue can be greatly reduced by restricting access to the management interface to only trusted administrators and from only internal IP addresses according to our recommended critical deployment guidelines https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-access-of-your-palo/ba-p/464431 . Customer firewall administrators do not have access to the packet capture feature in Cloud NGFW. This feature is available only to authorized Palo Alto Networks personnel permitted to perform troubleshooting. Prisma® Access is not impacted by this vulnerability.
EUVD references (1)
Affected products (3)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| Palo Alto Networks | Cloud NGFW |
All (unaffected)
|
— |
| Palo Alto Networks | PAN-OS |
11.2.0 (affected),
11.1.0 (affected),
10.2.0 (affected),
10.1.0 (affected)
|
— |
| Palo Alto Networks | Prisma Access |
All (unaffected)
|
— |
Vendor references (1)
References embedded in the original CVE record by the assigning CNA.
- https://security.paloaltonetworks.com/CVE-2025-0123 vendor-advisory
Web references (8)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- http://cwe.mitre.org/data/definitions/312.html rapid7:cwe.mitre.org
- https://attackerkb.com/topics/CVE-2025-0123 rapid7:attackerkb.com
- https://docs.paloaltonetworks.com/network-security/decryption/administration/monitoring-decryption/configure-decryption-port-mirroring rapid7:docs.paloaltonetworks.com
- https://docs.paloaltonetworks.com/pan-os/11-0/pan-os-admin/monitoring/take-packet-captures/take-a-custom-packet-capture rapid7:docs.paloaltonetworks.com
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-10810 rapid7:euvd.enisa.europa.eu
- https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-access-of-your-palo/ba-p/464431 rapid7:live.paloaltonetworks.com
- https://security.paloaltonetworks.com/CVE-2025-0123 rapid7:security.paloaltonetworks.com
- https://www.cve.org/CVERecord?id=CVE-2025-0123 rapid7:www.cve.org
NVD-tagged references (1)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://security.paloaltonetworks.com/CVE-2025-0123 psirt@paloaltonetworks.com
Remediations (10)
-
web:blog.qualys.com
As the year winds down, Microsoft Patch Tuesday in December arrives with essential fixes and enhancements to close vulnerabilities and boost performance.
2026-05-23 21:16 UTC -
web:cybersecuritynews.com
Microsoft released its final Patch Tuesday updates of 2025 on December 9, addressing 56 security vulnerabilities across Windows, Office, Exchange Server, and other components.
2026-05-23 21:16 UTC -
web:portal.msrc.microsoft.com
The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.
2026-05-23 21:16 UTC -
web:www.bleepingcomputer.com
Microsoft's December 2025 Patch Tuesday fixes 57 flaws, including one actively exploited and two publicly disclosed zero-day vulnerabilities.
2026-05-23 21:16 UTC -
web:www.cisa.gov
Updated October 29, 2025 : CISA has updated this Alert to include revised information on vulnerable product identification, potential threat activity detections, and additional resources. Microsoft released an update to address a critical remote code execution vulnerability impacting Windows Server Update Service (WSUS) in Windows Server (2012, 2016, 2019, 2022, and 2025 ), CVE - 2025 -59287
2026-05-23 21:16 UTC -
web:www.cisecurity.org
<p>Multiple vulnerabilities have been discovered in Microsoft products, the most severe of which could allow for remote code execution. Successful exploitation of the most severe of these vulnerabilities could result in an attacker gaining the same privileges as the logged-on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or ...
2026-05-23 21:16 UTC -
web:www.computerworld.com
Each month, the team at Readiness analyzes the latest Patch Tuesday updates from Microsoft and provides detailed, actionable testing guidance. The company's Patch Tuesday release for February ...
2026-05-23 21:16 UTC -
web:www.oracle.com
This Critical Patch Update contains 374 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at October 2025 Critical Patch Update: Executive Summary and Analysis.
2026-05-23 21:16 UTC -
web:www.tenable.com
Key takeaways: Microsoft's 2025 Patch Tuesday releases addressed 1,130 CVEs . This is the second year in a row where the CVE count was over 1,000. Elevation of Privilege vulnerabilities accounted for 38.3% of all Patch Tuesday vulnerabilities in 2025 , followed by Remote Code Execution flaws at 30.8%. 41 zero-day vulnerabilities were addressed across all Patch Tuesday releases in 2025 , including ...
2026-05-23 21:16 UTC -
web:www.zdnet.com
Why you need Microsoft's new emergency Windows patch - and the black-screen bug to watch for While Microsoft has been fixing bugs caused by the Patch Tuesday update, another glitch has surfaced.
2026-05-23 21:16 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2025-0123.json.
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"value": "This vulnerability requires the following configuration:<ol><li>An SSL decryption policy matching HTTP/2 data flows tied to a decryption profile without 'Strip ALPN' enabled;<br>and</li><li>Global HTTP/2 inspection enabled.<br><br>Note: Global HTTP/2 inspection is enabled by default. The setting to disable it is available only by using the PAN-OS command-line interface (CLI). To verify whether this feature is globally disabled use the following CLI commands:<p><tt>> set cli config-output-format set<br>> configure <br># show | match 'http2 enable no'</tt></p>\u2003\u2003- If there is no output, then http2 inspection is enabled.<br>\u2003\u2003- If output shows <tt>'set deviceconfig setting http2 enable no'</tt> then http2 traffic is classified as <tt>unknown-tcp</tt> and is not decrypted by the firewall, which makes clear-text data unreadable in packet captures.<br>\u2003\u2003<br></li></ol>"
}
],
"value": "This vulnerability requires the following configuration: * An SSL decryption policy matching HTTP/2 data flows tied to a decryption profile without 'Strip ALPN' enabled;\nand\n * Global HTTP/2 inspection enabled.\n\nNote: Global HTTP/2 inspection is enabled by default. The setting to disable it is available only by using the PAN-OS command-line interface (CLI). To verify whether this feature is globally disabled use the following CLI commands:> set cli config-output-format set\n>\u00a0configure \n# show | match\u00a0'http2 enable no'\n\n\u2003\u2003- If there is no output, then http2 inspection is enabled.\n\u2003\u2003- If output shows 'set deviceconfig setting http2 enable no' then http2 traffic is classified as unknown-tcp and is not decrypted by the firewall, which makes clear-text data unreadable in packet captures."
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"credits": [
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"datePublic": "2025-04-09T16:00:00.000Z",
"descriptions": [
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"value": "A vulnerability in the Palo Alto Networks PAN-OS\u00ae software enables unlicensed administrators to view clear-text data captured using the <a target=\"_blank\" rel=\"nofollow\" href=\"https://docs.paloaltonetworks.com/pan-os/11-0/pan-os-admin/monitoring/take-packet-captures/take-a-custom-packet-capture\">packet capture feature</a> in decrypted HTTP/2 data streams traversing network interfaces on the firewall. HTTP/1.1 data streams are not impacted.<br><br>In normal conditions, decrypted packet captures are available to firewall administrators after they obtain and install a free Decryption Port Mirror license. The license requirement ensures that this feature can only be used after approved personnel purposefully activate the license. For more information, review how to <a target=\"_blank\" rel=\"nofollow\" href=\"https://docs.paloaltonetworks.com/network-security/decryption/administration/monitoring-decryption/configure-decryption-port-mirroring\">configure decryption port mirroring</a>.<br><br>The administrator must obtain network access to the management interface (web, SSH, console, or telnet) and successfully authenticate to exploit this issue. Risk of this issue can be greatly reduced by restricting access to the management interface to only trusted administrators and from only internal IP addresses according to our recommended <a target=\"_blank\" rel=\"nofollow\" href=\"https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-access-of-your-palo/ba-p/464431\">critical deployment guidelines</a>.<br><br>Customer firewall administrators do not have access to the packet capture feature in Cloud NGFW. This feature is available only to authorized Palo Alto Networks personnel permitted to perform troubleshooting.<br><br>Prisma\u00ae Access is not impacted by this vulnerability."
}
],
"value": "A vulnerability in the Palo Alto Networks PAN-OS\u00ae software enables unlicensed administrators to view clear-text data captured using the packet capture feature https://docs.paloaltonetworks.com/pan-os/11-0/pan-os-admin/monitoring/take-packet-captures/take-a-custom-packet-capture in decrypted HTTP/2 data streams traversing network interfaces on the firewall. HTTP/1.1 data streams are not impacted.\n\nIn normal conditions, decrypted packet captures are available to firewall administrators after they obtain and install a free Decryption Port Mirror license. The license requirement ensures that this feature can only be used after approved personnel purposefully activate the license. For more information, review how to configure decryption port mirroring https://docs.paloaltonetworks.com/network-security/decryption/administration/monitoring-decryption/configure-decryption-port-mirroring .\n\nThe administrator must obtain network access to the management interface (web, SSH, console, or telnet) and successfully authenticate to exploit this issue. Risk of this issue can be greatly reduced by restricting access to the management interface to only trusted administrators and from only internal IP addresses according to our recommended critical deployment guidelines https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-access-of-your-palo/ba-p/464431 .\n\nCustomer firewall administrators do not have access to the packet capture feature in Cloud NGFW. This feature is available only to authorized Palo Alto Networks personnel permitted to perform troubleshooting.\n\nPrisma\u00ae Access is not impacted by this vulnerability."
}
],
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"supportingMedia": [
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"value": "Palo Alto Networks is not aware of any malicious exploitation of this issue."
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"value": "Palo Alto Networks is not aware of any malicious exploitation of this issue."
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"impacts": [
{
"capecId": "CAPEC-158",
"descriptions": [
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"value": "CAPEC-158: Sniffing Network Traffic"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NO",
"Recovery": "AUTOMATIC",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "LOCAL",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"privilegesRequired": "HIGH",
"providerUrgency": "AMBER",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "HIGH",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "DIFFUSE",
"vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:N/SA:N/AU:N/R:A/V:D/RE:M/U:Amber",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "MODERATE"
},
"format": "CVSS",
"scenarios": [
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"lang": "en",
"value": "Firewall administrators can see traffic that they should not be able to see, which impacts confidentiality but there is no impact to integrity or availability of that traffic."
}
]
},
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"cvssV4_0": {
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"Recovery": "AUTOMATIC",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "LOCAL",
"baseScore": 0,
"baseSeverity": "NONE",
"privilegesRequired": "HIGH",
"providerUrgency": "CLEAR",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "DIFFUSE",
"vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/AU:N/R:A/V:D/U:Clear",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "There is no risk if the firewall is licensed for decryption port mirroring because firewall administrators are already authorized to obtain decrypted packet captures from Palo Alto Networks firewalls."
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-312",
"description": "CWE-312 Cleartext Storage of Sensitive Information",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-04-11T17:43:05.126Z",
"orgId": "d6c1279f-00f6-4ef7-9217-f89ffe703ec0",
"shortName": "palo_alto"
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"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://security.paloaltonetworks.com/CVE-2025-0123"
}
],
"solutions": [
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"lang": "eng",
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"value": "This issue is fixed in PAN-OS 10.1.14-h13, PAN-OS 10.2.15, PAN-OS 11.1.8, PAN-OS 11.2.6, and all later PAN-OS versions.<br><br><table class=\"tbl\"><thead><tr><th>Version<br></th><th>Minor Version<br></th><th>Suggested Solution<br></th></tr></thead><tbody><tr><td>PAN-OS 11.2<br></td><td>11.2.0 through 11.2.5</td><td>Upgrade to 11.2.6 or later.<br></td></tr><tr><td>PAN-OS 11.1</td><td>11.1.0 through 11.1.7<br></td><td>Upgrade to 11.1.8 or later.</td></tr><tr><td>PAN-OS 11.0 (EoL)<br></td><td><br></td><td>Upgrade to a supported fixed version.<br></td></tr><tr><td>PAN-OS 10.2<br></td><td>10.2.0 through 10.2.14<br></td><td>Upgrade to 10.2.15 or later.<br><br></td></tr><tr><td>PAN-OS 10.1<br></td><td>10.1.0 through 10.1.14-h11<br></td><td>Upgrade to 10.1.14-h13 or later.<br></td></tr><tr><td>All other older<br>unsupported<br>PAN-OS versions</td><td> </td><td>Upgrade to a supported fixed version.</td></tr></tbody></table><br>To fully remediate risk, you must delete all pre-existing packet capture files stored on the firewall after you upgrade to a fixed PAN-OS version. This task can be performed through the PAN-OS web interface or through the PAN-OS CLI.<p><b>Using the Web Interface:</b></p>1. Select <b>Monitor</b> > <b>Packet Capture</b> > <b>Captured Files</b> > (Select All) and <b>Delete</b> the files.<br>2. Select <b>Yes</b> when prompted by the confirmation dialog.<p><b>Using the PAN-OS CLI:</b></p>1. Enter the following operational command:<br><p><tt>> delete debug-filter file * </tt></p>2. A confirmation prints to the terminal and indicates that all packet capture files were successfully deleted from the firewall:<br><p><tt>successfully removed * </tt></p>"
}
],
"value": "This issue is fixed in PAN-OS 10.1.14-h13, PAN-OS 10.2.15, PAN-OS 11.1.8, PAN-OS 11.2.6, and all later PAN-OS versions.\n\nVersion\nMinor Version\nSuggested Solution\nPAN-OS 11.2\n11.2.0 through 11.2.5Upgrade to 11.2.6 or later.\nPAN-OS 11.111.1.0 through 11.1.7\nUpgrade to 11.1.8 or later.PAN-OS 11.0 (EoL)\n\nUpgrade to a supported fixed version.\nPAN-OS 10.2\n10.2.0 through 10.2.14\nUpgrade to 10.2.15 or later.\n\nPAN-OS 10.1\n10.1.0 through 10.1.14-h11\nUpgrade to 10.1.14-h13 or later.\nAll other older\nunsupported\nPAN-OS versions\u00a0Upgrade to a supported fixed version.\nTo fully remediate risk, you must delete all pre-existing packet capture files stored on the firewall after you upgrade to a fixed PAN-OS version. This task can be performed through the PAN-OS web interface or through the PAN-OS CLI.Using the Web Interface:\n\n1. Select Monitor > Packet Capture > Captured Files > (Select All) and Delete the files.\n2. Select Yes when prompted by the confirmation dialog.Using the PAN-OS CLI:\n\n1. Enter the following operational command:\n> delete debug-filter file *\u00a0\n\n2. A confirmation prints to the terminal and indicates that all packet capture files were successfully deleted from the firewall:\nsuccessfully removed *"
}
],
"source": {
"defect": [
"PAN-257442"
],
"discovery": "INTERNAL"
},
"timeline": [
{
"lang": "en",
"time": "2025-04-09T16:00:00.000Z",
"value": "Initial Publication"
}
],
"title": "PAN-OS: Information Disclosure Vulnerability in HTTP/2 Packet Captures",
"workarounds": [
{
"lang": "en",
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"value": "Mitigation: In a Palo Alto Networks firewall, you can configure the decryption profile to <i><b>strip ALPN</b></i> (Application-Layer Protocol Negotiation) from the TLS handshake, which is used to negotiate the application protocol (e.g., HTTP/2 or HTTP/1.1) for the secured connection. When ALPN is absent, the following behaviors can occur:<br><ul><li><b>Firewall behavior</b>\u2014With no ALPN value available, the firewall cannot perform HTTP/2 inspection. It either forces the connection to downgrade to HTTP/1.1 (by letting the client and server negotiate a fallback) or, if that downgrade isn\u2019t possible, it can classify the traffic as <tt>unknown-tcp</tt> and potentially affects your security policy rules and application identification.</li><li><b>Client behavior</b>\u2014Most modern web browsers rely on ALPN to negotiate HTTP/2. If ALPN is missing, the client typically falls back to HTTP/1.1.</li><li><b>Server behavior</b>\u2014If ALPN is absent, the server can assume that the client supports only HTTP/1.1 and downgrades the connection accordingly. If the server enforces HTTP/2-only connections, then it may reject the handshake and cause a connection failure.</li></ul>Consequently, without ALPN, the Palo Alto Networks firewall does not inspect HTTP/2 connections, which prevents decrypted HTTP/2 (clear-text) traffic exposure to firewall administrators.<br><br>You can review how to strip ALPN and disable HTTP/2 inspection for targeted traffic in the <a target=\"_blank\" rel=\"nofollow\" href=\"https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-admin/app-id/http2#:~:text=Disable%20HTTP%2F2%20inspection%20for%20targeted%20traffic.\">App-ID and HTTP/2</a> inspection technical documentation.<br><br>Additional mitigation: The vast majority of firewalls already follow Palo Alto Networks and industry best practices. However, if you have not already, we strongly recommend that you secure access to your management interface according to our <a target=\"_blank\" rel=\"nofollow\" href=\"https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-access-of-your-palo/ba-p/464431\">critical deployment guidelines</a>. Specifically, you should restrict management interface access to only trusted internal IP addresses.<br><br>Review information about how to secure management access to your Palo Alto Networks firewalls:<br><ul><li>Palo Alto Networks LIVEcommunity article: <a target=\"_blank\" rel=\"nofollow\" href=\"https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-access-of-your-palo/ba-p/464431\">https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-ac...</a></li><li>Palo Alto Networks official and detailed technical documentation: <a target=\"_blank\" rel=\"nofollow\" href=\"https://docs.paloaltonetworks.com/best-practices/10-1/administrative-access-best-practices/administrative-access-best-practices/deploy-administrative-access-best-practices\">https://docs.paloaltonetworks.com/best-practices/10-1/administrative-access-best-practices/administr...</a></li></ul>"
}
],
"value": "Mitigation: In a Palo Alto Networks firewall, you can configure the decryption profile to strip ALPN (Application-Layer Protocol Negotiation) from the TLS handshake, which is used to negotiate the application protocol (e.g., HTTP/2 or HTTP/1.1) for the secured connection. When ALPN is absent, the following behaviors can occur:\n * Firewall behavior\u2014With no ALPN value available, the firewall cannot perform HTTP/2 inspection. It either forces the connection to downgrade to HTTP/1.1 (by letting the client and server negotiate a fallback) or, if that downgrade isn\u2019t possible, it can classify the traffic as unknown-tcp and potentially affects your security policy rules and application identification.\n * Client behavior\u2014Most modern web browsers rely on ALPN to negotiate HTTP/2. If ALPN is missing, the client typically falls back to HTTP/1.1.\n * Server behavior\u2014If ALPN is absent, the server can assume that the client supports only HTTP/1.1 and downgrades the connection accordingly. If the server enforces HTTP/2-only connections, then it may reject the handshake and cause a connection failure.\n\n\nConsequently, without ALPN, the Palo Alto Networks firewall does not inspect HTTP/2 connections, which prevents decrypted HTTP/2 (clear-text) traffic exposure to firewall administrators.\n\nYou can review how to strip ALPN and disable HTTP/2 inspection for targeted traffic in the App-ID and HTTP/2 https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-admin/app-id/http2#:~:text=Disable%20HTTP%2F2%20inspection%20for%20targeted%20traffic. inspection technical documentation.\n\nAdditional mitigation: The vast majority of firewalls already follow Palo Alto Networks and industry best practices. However, if you have not already, we strongly recommend that you secure access to your management interface according to our critical deployment guidelines https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-access-of-your-palo/ba-p/464431 . Specifically, you should restrict management interface access to only trusted internal IP addresses.\n\nReview information about how to secure management access to your Palo Alto Networks firewalls:\n * Palo Alto Networks LIVEcommunity article: https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-ac... https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-access-of-your-palo/ba-p/464431 \n * Palo Alto Networks official and detailed technical documentation:\u00a0 https://docs.paloaltonetworks.com/best-practices/10-1/administrative-access-best-practices/administr... https://docs.paloaltonetworks.com/best-practices/10-1/administrative-access-best-practices/administrative-access-best-practices/deploy-administrative-access-best-practices"
}
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"assignerOrgId": "d6c1279f-00f6-4ef7-9217-f89ffe703ec0",
"assignerShortName": "palo_alto",
"cveId": "CVE-2025-0123",
"datePublished": "2025-04-11T17:43:05.126Z",
"dateReserved": "2024-12-20T23:23:24.262Z",
"dateUpdated": "2025-04-11T18:36:46.622Z",
"state": "PUBLISHED"
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