How severe is CVE-2022-0028?

CVE-2022-0028 has a CVSS score of 8.6/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2022-0028?

Affected package information for CVE-2022-0028 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2022-0028?

No fixed version has been published for CVE-2022-0028 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2022-0028 actively exploited in the wild?

Yes. There are 2 known exploit references for CVE-2022-0028, including 2 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2022-0028?

CVE-2022-0028 has an EPSS (Exploit Prediction Scoring System) score of 4.7%, placing it in the 90th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

Is CVE-2022-0028 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2022-0028 (Palo Alto Networks PAN-OS Reflected Amplification Denial-of-Service Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2022-08-22. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-09-12. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2022-0028?

CVE-2022-0028 is classified as CWE-406 (CWE-406). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2022-0028?

CVE-2022-0028 affects paloaltonetworks pan-os (6 versions, e.g. 8.1.23, 9.0.16, 9.1.14…). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2022-0028 published, and has it been updated?

CVE-2022-0028 was published on August 10, 2022 and was last updated on November 4, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2022-0028: PAN-OS CWE-406 (High 8.6)

EPSS Exploitation Probability

via FIRST.org ↗

4.7%probability of exploitation in next 30 days

Lower Risk90th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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.

Affected Products

1 product · 16 configurations

OS

pan-ospaloaltonetworks

≥ 10.2.0 && < 10.2.2

6 versions

8.1.239.0.169.1.1410.0.1110.1.610.2.2

Frequently Asked Questions

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

O3 Security · Impact-Aware SCA

Is CVE-2022-0028 in your stack?

O3 detects CVE-2022-0028 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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