CVE-2022-0028
Palo Alto Networks PAN-OS Reflected Amplification Denial-of-Service Vulnerability
Published Aug 10, 2022 · updated Jun 16, 2026 · paloaltonetworks 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.
Timeline
Detection, updates, and resolution for this record.
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
Aug 22, 2022 · CISA KEV
Known exploited
Apply updates per vendor instructions.
Sep 12, 2022 · CISA KEV
Remediation due
Apply updates per vendor instructions.
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
Required action
Apply updates per vendor instructions.
CISA due date Sep 12, 2022
Affected
- cpe paloaltonetworks/pan-osversion unspecified
- cpe paloaltonetworks/pan-os8.1.23
- cpe paloaltonetworks/pan-os9.0.16
- vendor Palo Alto Networks PAN-OSversion unspecified
Sources
- CISA KEVCVE-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.orgCVE-2022-0028
Official CVE identifier
cve.org - FIRST EPSSCVE-2022-0028
30-day exploitation probability 2.5%
first.org - NIST NVDCVE-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