Reference page — cumulative record through Monday, October 5, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2022-0028
Palo Alto Networks Cloud NGFW — PAN-OS: Reflected Amplification Denial-of-Service (DoS) Vulnerability in URL Filtering
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N N C N N H 8.6 .0254 84.5 YES
AFFECTED
Product Versions Fixed
Cloud NGFW unspecified All
PAN-OS 8.1 – 8.1.23-h1
Prisma Access unspecified 2.1 All
TIMELINE
Dec 28 Reserved by palo_alto
Aug 10 Published (CNA: palo_alto)
Aug 22 Added to CISA KEV, remediation due 2022-09-12
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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| December 28, 2021 | Reserved | Reserved by palo_alto |
| August 10, 2022 | Published | Published (CNA: palo_alto) |
| August 22, 2022 | KEV ADDED | Added to CISA KEV, remediation due 2022-09-12 |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2022-0028 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 5, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
