CVE-2024-3393
📛 CVE Title
PAN-OS: Firewall Denial of Service (DoS) in DNS Security Using a Specially Crafted Packet
Description
A Denial of Service vulnerability in the DNS Security feature of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to send a malicious packet through the data plane of the firewall that reboots the firewall. Repeated attempts to trigger this condition will cause the firewall to enter maintenance mode.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- palo_alto
- CVSS severity
- HIGH
- CVSS score
- 8.7 / 10
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:N/R:U/V:C/RE:M/U:Amber- Effective score
- 8.7 / 10 HIGH source: CNA overview
- CWE(s)
-
CWE-754 - Reserved
- 2024-04-05
- Published
- 2024-12-27 09:44 UTC
- Last updated
- 2025-10-21 22:55 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2024/3xxx/CVE-2024-3393.json
- Linked Threat
- CVE-2024-3393 — PAN-OS: Firewall Denial of Service (DoS) in DNS Security Using a Specially Crafted Packet
CISA Known Exploited Vulnerabilities CISA KEV
CISA has confirmed in-the-wild exploitation of this CVE. Federal agencies must remediate by the due date below; private orgs should treat it as priority-1.
- Vulnerability name
- Palo Alto Networks PAN-OS Malicious DNS Packet Vulnerability
- Vendor / project
- Palo Alto Networks
- Product
- PAN-OS
- Date added to KEV
- 2024-12-30
- Remediation due
- 2025-01-20
- Required action
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- Ransomware campaign use
- Unknown
- CISA notes
- https://security.paloaltonetworks.com/CVE-2024-3393 ; https://nvd.nist.gov/vuln/detail/CVE-2024-3393
- CISA listing
- www.cisa.gov/known-exploited-vulnerabilities-catalog
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
- 2024-12-27 10:15:17 UTC
- NVD last modified
- 2025-11-04 16:49:18 UTC
- NVD CVSS v3.1
- 7.5 / 10 HIGH source: nvd@nist.gov
- NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Exploitability subscore
- 3.9 / 10
- Impact subscore
- 3.6 / 10
- EPSS score
- 0.7972 (probability of exploitation in next 30 days)
- EPSS percentile
- 99.12% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24
NVD / KEV / EPSS data refreshed 2026-05-25 01:24 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-2024-31982 - Assigner
- palo_alto
- Published
- Dec 27, 2024, 9:44:24 AM
- Updated
- Oct 21, 2025, 10:55:33 PM
- EUVD base score (CVSS 4.0)
-
8.7 / 10
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:N/R:U/V:C/RE:M/U:Amber - EUVD-reported EPSS
- 79.7200
- Vendors
- Palo Alto Networks
- Products
-
PAN-OS (10.2.8 <10.2.8-h19)PAN-OSPAN-OS (10.1.14 <10.1.14-h8)Cloud NGFWPAN-OS (11.2.0 <11.2.3)PAN-OS (11.1.0 <11.1.2-h16)
- Aliases
-
GHSA-gm94-vr86-wgqv
ENISA description: A Denial of Service vulnerability in the DNS Security feature of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to send a malicious packet through the data plane of the firewall that reboots the firewall. Repeated attempts to trigger this condition will cause the firewall to enter maintenance mode.
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),
10.2.8 (affected),
10.1.14 (affected)
|
— |
| Palo Alto Networks | PAN-OS |
10.2.0 (unaffected),
11.2.0 (affected)
|
Prisma Access |
Affected products — CPE 2.3 (60) NVD
NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.
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Vendor references (1)
References embedded in the original CVE record by the assigning CNA.
- https://security.paloaltonetworks.com/CVE-2024-3393 vendor-advisory
Web references (5)
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/754.html rapid7:cwe.mitre.org
- https://attackerkb.com/topics/CVE-2024-3393 rapid7:attackerkb.com
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2024-31982 rapid7:euvd.enisa.europa.eu
- https://security.paloaltonetworks.com/CVE-2024-3393 rapid7:security.paloaltonetworks.com
- https://www.cve.org/CVERecord?id=CVE-2024-3393 rapid7:www.cve.org
NVD-tagged references (2)
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-2024-3393 psirt@paloaltonetworks.com Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-3393 134c704f-9b21-4f2e-91b3-4a467353bcc0 US Government Resource
Indicators (1)
IOCs linked to the auto-promoted Threat row.
| Type | Value | VirusTotal | Attached |
|---|---|---|---|
| cve |
CVE-2024-3393
|
no local data | 2026-05-14 09:34 UTC |
Remediations (8)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:app.opencve.io
Remediation Vendor Workaround If your firewall running the vulnerable PAN-OS versions stops responding or reboots unexpectedly and you cannot immediately apply a fix , apply a workaround below based on your deployment.
2026-05-17 09:55 UTC -
web:cvefeed.io
A Denial of Service vulnerability in the DNS Security feature of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to send a malicious packet through the data plane of the firewall that reboots the firewall. Repeated attempts to trigger this condition will cause the firewall to enter maintenance mode.
2026-05-17 09:55 UTC -
web:nvd.nist.gov
Secure .gov websites use HTTPS A lock () or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.
2026-05-17 09:55 UTC -
web:security.paloaltonetworks.com
Palo Alto Networks Security Advisory: CVE-2024-3393 PAN-OS: Firewall Denial of Service (DoS) in DNS Security Using a Specially Crafted Packet A Denial of Service vulnerability in the DNS Security feature of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to send a malicious packet through the data plane of the firewall that reboots the firewall. Repeated attempts to ...
2026-05-17 09:55 UTC -
web:support.servicenow.com
Overview The advisories below document publicly disclosed Common Vulnerabilities and Exposures ( CVEs ) in the Now Platform by ServiceNow. Because ServiceNow uses various methods to communicate vulnerability information, patches, and other fixes, customers should review family, security patch , and hotfix release notes, which are available at https://docs.servicenow.com, for a complete list of ...
2026-05-17 09:55 UTC -
web:thehackernews.com
CVE-2024-3393 , a critical PAN-OS flaw (CVSS 8.7), allows unauthenticated DoS attacks; update to the latest patches to secure firewalls.
2026-05-17 09:55 UTC -
web:www.cycognito.com
CVE-2024-3393 is a high severity Denial of Service (DoS) vulnerability affecting specific versions of Palo Alto Networks PAN-OS DNS Security feature.
2026-05-17 09:55 UTC -
web:www.oracle.com
This Critical Patch Update contains 481 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 April 2026 Critical Patch Update: Executive Summary and Analysis.
2026-05-17 09:55 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2024-3393.json.
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"at": "10.2.8",
"status": "affected"
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"configurations": [
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"lang": "en",
"supportingMedia": [
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"type": "text/html",
"value": "<p>Both of the following must be true for PAN-OS software to be affected:<br></p><ol><li>Either a DNS Security License or an Advanced DNS Security License must be applied, AND<br></li><li>DNS Security logging must be enabled.</li></ol>"
}
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"value": "Both of the following must be true for PAN-OS software to be affected:\n\n\n * Either a DNS Security License or an Advanced DNS Security License must be applied, AND\n\n * DNS Security logging must be enabled."
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "Palo Alto Networks thanks the CERT-EE team for their extra effort in providing invaluable forensic and analytic assistance."
}
],
"datePublic": "2024-12-27T02:30:00.000Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
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"value": "A Denial of Service vulnerability in the DNS Security feature of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to send a malicious packet through the data plane of the firewall that reboots the firewall. Repeated attempts to trigger this condition will cause the firewall to enter maintenance mode."
}
],
"value": "A Denial of Service vulnerability in the DNS Security feature of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to send a malicious packet through the data plane of the firewall that reboots the firewall. Repeated attempts to trigger this condition will cause the firewall to enter maintenance mode."
}
],
"exploits": [
{
"lang": "en",
"supportingMedia": [
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"value": "Palo Alto Networks is aware of customers experiencing this denial of service (DoS) when their firewall blocks malicious DNS packets that trigger this issue."
}
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"value": "Palo Alto Networks is aware of customers experiencing this denial of service (DoS) when their firewall blocks malicious DNS packets that trigger this issue."
}
],
"impacts": [
{
"capecId": "CAPEC-540",
"descriptions": [
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"lang": "en",
"value": "CAPEC-540 Overread Buffers"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
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"Recovery": "USER",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 8.7,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"providerUrgency": "AMBER",
"subAvailabilityImpact": "LOW",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "CONCENTRATED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:N/R:U/V:C/RE:M/U:Amber",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
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"vulnerabilityResponseEffort": "MODERATE"
},
"format": "CVSS",
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"value": "An attacker sends a malicious packet through the firewall, which processes a malicious packet that triggers this issue."
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]
},
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"vulnConfidentialityImpact": "NONE",
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"format": "CVSS",
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"value": "Prisma Access, when only providing access to authenticated end users, processes a malicious packet that triggers this issue."
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"description": "CWE-754 Improper Check for Unusual or Exceptional Conditions",
"lang": "en",
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"dateUpdated": "2024-12-28T01:51:29.594Z",
"orgId": "d6c1279f-00f6-4ef7-9217-f89ffe703ec0",
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"url": "https://security.paloaltonetworks.com/CVE-2024-3393"
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"value": "<p><span>This issue is fixed in PAN-OS 10.1.14-h8, PAN-OS 10.2.10-h12, PAN-OS 11.1.5, PAN-OS 11.2.3, and all later PAN-OS versions.</span></p><p><span>Note: PAN-OS 11.0 reached the end of life (EOL) on November 17, 2024, so we do not intend to provide a fix for this release.</span></p><p><span>Prisma Access customers using DNS Security with affected PAN-OS versions should apply one of the workarounds provided below. We will perform upgrades in two phases for impacted customers on the weekends of January 3rd and January 10th. You can request an expedited Prisma Access upgrade to the latest PAN-OS version by opening a </span><a target=\"_blank\" rel=\"nofollow\" href=\"https://support.paloaltonetworks.com/Support/Index\"><span>support case</span></a><span>.</span></p><p><span><span>In addition, to provide the most seamless upgrade path for our customers, we are making fixes available for other TAC-preferred and commonly deployed maintenance releases.</span></span></p><p>\u200b\u200bAdditional PAN-OS 11.1 fixes:</p><div><ul><li>11.1.2-h16</li><li>11.1.3-h13</li><li>11.1.4-h7</li><li>11.1.5</li></ul></div><div>Additional PAN-OS 10.2 fixes:</div><div><ul><li>10.2.8-h19</li><li>10.2.9-h19</li><li>10.2.10-h12</li><li>10.2.11-h10</li><li>10.2.12-h4</li><li>10.2.13-h2</li><li>10.2.14</li></ul></div><div>Additional PAN-OS 10.1 fixes:</div><div><ul><li>10.1.14-h8</li><li>10.1.15</li></ul></div><div>Additional PAN-OS fixes only applicable to Prisma Access:</div><div><ul><li>10.2.9-h19</li><li>10.2.10-h12</li></ul></div>"
}
],
"value": "This issue is fixed in PAN-OS 10.1.14-h8, PAN-OS 10.2.10-h12, PAN-OS 11.1.5, PAN-OS 11.2.3, and all later PAN-OS versions.\n\nNote: PAN-OS 11.0 reached the end of life (EOL) on November 17, 2024, so we do not intend to provide a fix for this release.\n\nPrisma Access customers using DNS Security with affected PAN-OS versions should apply one of the workarounds provided below. We will perform upgrades in two phases for impacted customers on the weekends of January 3rd and January 10th. You can request an expedited Prisma Access upgrade to the latest PAN-OS version by opening a support case https://support.paloaltonetworks.com/Support/Index .\n\nIn addition, to provide the most seamless upgrade path for our customers, we are making fixes available for other TAC-preferred and commonly deployed maintenance releases.\n\n\u200b\u200bAdditional PAN-OS 11.1 fixes:\n\n * 11.1.2-h16\n * 11.1.3-h13\n * 11.1.4-h7\n * 11.1.5\n\n\n\n\nAdditional PAN-OS 10.2 fixes:\n\n * 10.2.8-h19\n * 10.2.9-h19\n * 10.2.10-h12\n * 10.2.11-h10\n * 10.2.12-h4\n * 10.2.13-h2\n * 10.2.14\n\n\n\n\nAdditional PAN-OS 10.1 fixes:\n\n * 10.1.14-h8\n * 10.1.15\n\n\n\n\nAdditional PAN-OS fixes only applicable to Prisma Access:\n\n * 10.2.9-h19\n * 10.2.10-h12"
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"source": {
"defect": [
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"discovery": "USER"
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"timeline": [
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"lang": "en",
"time": "2024-12-27T02:30:00.000Z",
"value": "Initial publication"
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"title": "PAN-OS: Firewall Denial of Service (DoS) in DNS Security Using a Specially Crafted Packet",
"workarounds": [
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"value": "If your firewall running the vulnerable PAN-OS versions stops responding or reboots unexpectedly and you cannot immediately apply a fix, apply a workaround below based on your deployment.<br><br><b>Unmanaged NGFWs, NGFW managed by Panorama, or Prisma Access managed by Panorama</b><b><br></b><ol><li>For each Anti-spyware profile, navigate to Objects \u2192 Security Profiles \u2192 Anti-spyware \u2192 (select a profile) \u2192 DNS Policies \u2192 DNS Security.</li><li>Change the Log Severity to \"none\" for all configured DNS Security categories.<br></li><li>Commit the changes.<br></li></ol>Remember to revert the Log Severity settings once the fixes are applied.<br><br><b>NGFW managed by Strata Cloud Manager (SCM)</b><br><br><div><div>You can choose one of the following mitigation options:</div><div><ol><li>Option 1: Disable DNS Security logging directly on each NGFW by following the PAN-OS steps above.</li><li>Option 2: Disable DNS Security logging across all NGFWs in your tenant by opening a <a target=\"_blank\" rel=\"nofollow\" href=\"https://support.paloaltonetworks.com/Support/Index\">support case</a>.</li></ol></div><b><p>Prisma Access managed by Strata Cloud Manager (SCM)</p></b></div><p>Until we perform an upgrade of your Prisma Access tenant, you can disable DNS Security logging across all NGFWs in your tenant by opening a <a target=\"_blank\" rel=\"nofollow\" href=\"https://support.paloaltonetworks.com/Support/Index\">support case</a>. If you would like to expedite the upgrade, please make a note of that in the support case.</p><b></b>"
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"datePublished": "2024-12-27T09:44:24.538Z",
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"dateUpdated": "2025-10-21T22:55:33.618Z",
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