Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 2.4%; technical severity is CVSS 8.6.
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.
Who should care
- Teams operating PAN-OS, Pan-os
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether PAN-OS, Pan-os is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Palo Alto Networks Mitigation guidance CVE-2022-0028
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- CWE
- CWE-940
- Affected versions
- Palo Alto Networks PAN-OS; Paloaltonetworks Pan-os (Start Including 8.1.0, End Excluding 8.1.23 | Start Including 9.0.0, End Excluding 9.0.16 | Start Including 9.1.0, End Excluding 9.1.14 | Start Including 10.0.0, End Excluding 10.0.11)
- Fixed versions
- Paloaltonetworks Pan-os (Fixed from 8.1.23, 9.0.16, 9.1.14, 10.0.11, 10.1.6, 10.2.2)
- Published
- 10 August 2022
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 2.4%
- Signal calculated at 67