CVE-2022-0028

Description

A PAN-OS URL filtering policy misconfiguration could allow a network-based attacker to conduct reflected and amplified TCP denial-of-service (RDoS) attacks. The DoS attack would appear to originate from a Palo Alto Networks PA-Series (hardware), VM-Series (virtual) and CN-Series (container) firewall against an attacker-specified target. To be misused by an external attacker, the firewall configuration must have a URL filtering profile with one or more blocked categories assigned to a security rule with a source zone that has an external facing network interface. This configuration is not typical for URL filtering and, if set, is likely unintended by the administrator. If exploited, this issue would not impact the confidentiality, integrity, or availability of our products. However, the resulting denial-of-service (DoS) attack may help obfuscate the identity of the attacker and implicate the firewall as the source of the attack. We have taken prompt action to address this issue in our PAN-OS software. All PAN-OS software updates for this issue are now available. This issue does not impact Panorama M-Series or Panorama virtual appliances. This issue has been resolved for all Cloud NGFW and Prisma Access customers and no additional action is required from them.

Description (MITRE) cveawg.mitre.org

Pulled from cveawg.mitre.org/api/cve/CVE-2022-0028 on 2026-07-28. Shown when MITRE's text differs from the cvelistV5 mirror.

A PAN-OS URL filtering policy misconfiguration could allow a network-based attacker to conduct reflected and amplified TCP denial-of-service (RDoS) attacks. The DoS attack would appear to originate from a Palo Alto Networks PA-Series (hardware), VM-Series (virtual) and CN-Series (container) firewall against an attacker-specified target. To be misused by an external attacker, the firewall configuration must have a URL filtering profile with one or more blocked categories assigned to a source zone that has an external facing interface. This configuration is not typical for URL filtering and, if set, is likely unintended by the administrator. If exploited, this issue would not impact the confidentiality, integrity, or availability of our products. However, the resulting denial-of-service (DoS) attack may help obfuscate the identity of the attacker and implicate the firewall as the source of the attack. We have taken prompt action to address this issue in our PAN-OS software. All software updates for this issue are expected to be released no later than the week of August 15, 2022. This issue does not impact Panorama M-Series or Panorama virtual appliances. This issue has been resolved for all Cloud NGFW and Prisma Access customers and no additional action is required from them.

Overview

State

—

Assigner (CNA)

—

CVSS severity

MEDIUM

CVSS score

5.0 / 10

CVSS vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Effective score

5.0 / 10 MEDIUM source: CNA overview

CWE(s)

—

Reserved

—

Published

2022-08-10 00:00 UTC

Last updated

—

Source

https://www.rapid7.com/db/vulnerabilities/palo-alto-networks-pan-os-cve-2022-0028/

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 Reflected Amplification Denial-of-Service Vulnerability

Vendor / project

Palo Alto Networks

Product

PAN-OS

Date added to KEV

2022-08-22

Remediation due

2022-09-12

Required action

Apply updates per vendor instructions.

Ransomware campaign use

Unknown

CISA notes

https://security.paloaltonetworks.com/CVE-2022-0028; https://nvd.nist.gov/vuln/detail/CVE-2022-0028

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

2022-08-10 16:15:08 UTC

NVD last modified

2026-06-17 04:19:55 UTC

NVD CVSS v3.1

8.6 / 10 HIGH source: psirt@paloaltonetworks.com

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Exploitability subscore

3.9 / 10

Impact subscore

4.0 / 10

EPSS score

0.0213 (probability of exploitation in next 30 days)

EPSS percentile

80.00% vs all CVEs — higher = more likely to be exploited, as of 2026-07-27

NVD-assigned CWE(s): CWE-406 (differs from the CNA list above)

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-2022-15249

Assigner

palo_alto

Published

Aug 10, 2022, 4:00:16 PM

Updated

Oct 21, 2025, 11:15:36 PM

EUVD base score (CVSS 3.1)

8.6 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

EUVD-reported EPSS

2.3700

Vendors

Palo Alto Networks

Products

PAN-OS (10.1 <10.1.6-h6)

PAN-OS (8.1 <8.1.23-h1)

PAN-OS (10.2 <10.2.2-h2)

PAN-OS (10.0 <10.0.11-h1)

PAN-OS (9.0 <9.0.16-h3)

PAN-OS (9.1 <9.1.14-h4)

Aliases

GHSA-r3j6-h9rm-9q33

ENISA description: A PAN-OS URL filtering policy misconfiguration could allow a network-based attacker to conduct reflected and amplified TCP denial-of-service (RDoS) attacks. The DoS attack would appear to originate from a Palo Alto Networks PA-Series (hardware), VM-Series (virtual) and CN-Series (container) firewall against an attacker-specified target. To be misused by an external attacker, the firewall configuration must have a URL filtering profile with one or more blocked categories assigned to a source zone that has an external facing interface. This configuration is not typical for URL filtering and, if set, is likely unintended by the administrator. If exploited, this issue would not impact the confidentiality, integrity, or availability of our products. However, the resulting denial-of-service (DoS) attack may help obfuscate the identity of the attacker and implicate the firewall as the source of the attack. We have taken prompt action to address this issue in our PAN-OS software. All software updates for this issue are expected to be released no later than the week of August 15, 2022. This issue does not impact Panorama M-Series or Panorama virtual appliances. This issue has been resolved for all Cloud NGFW and Prisma Access customers and no additional action is required from them.

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

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/406.html rapid7:cwe.mitre.org
• https://attackerkb.com/topics/CVE-2022-0028 rapid7:attackerkb.com
• https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-15249 rapid7:euvd.enisa.europa.eu
• https://security.paloaltonetworks.com/CVE-2022-0028 rapid7:security.paloaltonetworks.com
• https://www.cve.org/CVERecord?id=CVE-2022-0028 rapid7:www.cve.org

• Micropatches - 0patch
  web:0patch.com

  Fixing what's really important. The goal of 0patch is not to micropatch every vulnerability but the important ones, such as those exploited in the wild or those without official vendor patches. These are some of our most popular micropatches.

  2026-06-04 05:12 UTC
• Microsoft and Adobe Patch Tuesday, February 2026 Security Update Review
  web:blog.qualys.com

  Microsoft's February 2026 Patch Tuesday focuses on closing security gaps that attackers could exploit, reinforcing the importance of timely patching in enterprise environments. Here's a quick…

  2026-06-04 05:12 UTC
• Microsoft Patch Tuesday March 2026 - 78 Vulnerabilities Fixed ...
  web:cybersecuritynews.com

  Microsoft released its March 2026 Patch Tuesday security update on March 10, 2026, addressing 78 vulnerabilities across Windows, Microsoft Office, Azure, SQL Server, and .NET. The update includes one actively exploited zero-day vulnerability and multiple Critical-rated flaws demanding immediate attention from security teams. The most urgent fix this month is CVE -2026-21262, the sole zero-day ...

  2026-06-04 05:12 UTC
• Microsoft Patch Tuesday, September 2025 Edition - Krebs on Security
  web:krebsonsecurity.com

  Microsoft Corp. today issued security updates to fix more than 80 vulnerabilities in its Windows operating systems and software. There are no known "zero-day" or actively exploited vulnerabilities ...

  2026-06-04 05:12 UTC
• Security Update Guide - Microsoft
  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.

  2026-06-04 05:12 UTC
• CVE-2022-0028 — CVE Details & Analysis — SOCRadar Labs
  web:socradar.io

  Get detailed information, analysis, and insights for CVE-2022-0028 . Explore CVSS scores, affected software, exploits, and related threats.

  2026-06-04 05:12 UTC
• Microsoft March 2026 Patch Tuesday fixes 2 zero-days, 79 flaws
  web:www.bleepingcomputer.com

  Today is Microsoft's March 2026 Patch Tuesday with security updates for 79 flaws, including 2 publicly disclosed zero-day vulnerabilities.

  2026-06-04 05:12 UTC
• February's Patch Tuesday release fixes 59 flaws ... - Computerworld
  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 ...

  2026-06-04 05:12 UTC
• Microsoft Patch Tuesday - May 2026 - Lansweeper
  web:www.lansweeper.com

  Which vulnerabilities, issues, and other things did Microsoft update? Discover what's new using Lansweeper's Patch Tuesday May 2026 summary.

  2026-06-04 05:12 UTC
• Patch Tuesday June 2026: Security Updates & CVE Analysis
  web:zecurit.com

  Get the complete breakdown of Microsoft's June 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

  2026-06-04 05:12 UTC

Only Available for Registered Users. Sign in to view.