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01 Record

CVE-2022-0028

PAN-OS: Reflected Amplification Denial-of-Service (DoS) Vulnerability in URL Filtering

HighKEVPUBLISHEDCNA: palo_alto
CNA base score8.6 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

02 Description

PAN-OS: Reflected Amplification Denial-of-Service (DoS) Vulnerability in URL Filtering

03 Exploitation and scoring

Exploitation
Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2022-08-22. Federal remediation due 2022-09-12.
SSVC decision
  • ExploitationactiveCISA reports credible evidence of active exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
2.69% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 85.7% of scored records. A rank, not a probability.
NVD base score
8.6 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVD analysis status
Analyzed. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2022-08-10 16:00Z4 YR AGO
Last updated
2025-10-21 23:15Z1 YR AGO
Reserved
2021-12-28
Assigning CNA
palo_alto
Record state
PUBLISHED
Severity
High (CVSS 8.6)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Weaknesses
  • CWE-406Insufficient Control of Network Message Volume (Network Amplification)Class
Data version
5.1
Document digest
349c1f55889f16d6be79f8305641e20a23eebbc5750ec88c7953003a6fd224fb

05 Affected products

VendorProductVersionsPlatforms
Palo Alto NetworksCloud NGFWNot specified—
Palo Alto NetworksPAN-OS8.1 to < 8.1.23-h1, 9.0 to < 9.0.16-h3, 9.1 to < 9.1.14-h4, 10.0 to < 10.0.11-h1, 10.1 to < 10.1.6-h6, 10.2 to < 10.2.2-h2—
Palo Alto NetworksPrisma AccessNot specified—
paloaltonetworkspan-os8.1.0 to < 8.1.23-h, 9.0.0 to < 9.0.16-h3, 9.1.0 to < 9.1 < 9.1.14-h4, 10.0.0 to < 10.0.11-h1, 10.1.0 to < 10.1.6-h6, 10.2.0 to < 10.2.2-h2—

06 References

07 Remediation

We identified workarounds to prevent the denial-of-service (DoS) attacks that result from this issue in certain Palo Alto Networks firewalls, with this policy configuration We intend to fix this issue for PA-Series, VM-Series and CN-Series firewalls with a fix in the following PAN-OS software releases: PAN-OS 8.1.23-h1 (ETA: week of August 8, 2022), PAN-OS 9.0.16-h3 (ETA: week of August 15, 2022), PAN-OS 9.1.14-h4 (ETA: week of August 15, 2022), PAN-OS 10.0.11-h1 (ETA: week of August 15, 2022), PAN-OS 10.1.6-h6 (ETA: week of August 8, 2022), and PAN-OS 10.2.2-h2 (ETA: week of August 15, 2022). We expect to release all PAN-OS software updates for this issue no later than the week of August 15, 2022.