ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2022-0028

Palo Alto Networks PAN-OS Reflected Amplification Denial-of-Service Vulnerability

Published Aug 10, 2022 · catalog updated Jun 16, 2026 · Palo Alto Networks PAN-OS

Patch now

CVE-2022-0028 is in the CISA known-exploited catalog, due Sep 12, 2022. Confirm Palo Alto Networks PAN-OS against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
High8.6
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
2.54%
Remediation
Remediation guidance
Affected products
cpe paloaltonetworks/pan-os · vendor Palo Alto Networks PAN-OS

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe paloaltonetworks/pan-os8.1.23
  • cpe paloaltonetworks/pan-os9.0.16
  • vendor Palo Alto Networks PAN-OSversion unspecified

How to fix CVE-2022-0028

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2022-0028 is in the CISA known-exploited catalog, due Sep 12, 2022. Confirm Palo Alto Networks PAN-OS against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with 8.1.23, 9.0.16. Apply updates per vendor instructions.

What should an analyst verify?

CWE-406; CWE-940. EPSS 2.54%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 10, 2022 · Catalog

    Detected

    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 configura

  2. Aug 22, 2022 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Sep 12, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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 configura

Sources

  • CISA KEVConfirmed exploitationCVE-2022-0028

    A Palo Alto Networks PAN-OS URL filtering policy misconfiguration could allow a network-based attacker to conduct reflected and amplified TCP denial-of-service (RDoS) attacks.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2022-0028

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2022-0028

    30-day exploitation probability 2.5%

    first.org
  • NIST NVDVulnerability recordCVE-2022-0028

    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

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2022-0028

    A Palo Alto Networks PAN-OS URL filtering policy misconfiguration could allow a network-based attacker to conduct reflected and amplified TCP denial-of-service (RDoS) attacks.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.