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CVE-2022-0023

PAN-OS: Denial-of-Service (DoS) Vulnerability in DNS Proxy

Medium5.9EPSS 0.73%
Published
Updated
Reserved
Assigned by
palo_alto

Description

An improper handling of exceptional conditions vulnerability exists in the DNS proxy feature of Palo Alto Networks PAN-OS software that enables a meddler-in-the-middle (MITM) to send specifically crafted traffic to the firewall that causes the service to restart unexpectedly. Repeated attempts to send this request result in denial-of-service to all PAN-OS services by restarting the device in maintenance mode. This issue does not impact Panorama appliances and Prisma Access customers. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.22; PAN-OS 9.0 versions earlier than PAN-OS 9.0.16; PAN-OS 9.1 versions earlier than PAN-OS 9.1.13; PAN-OS 10.0 versions earlier than PAN-OS 10.0.10; PAN-OS 10.1 versions earlier than PAN-OS 10.1.5. This issue does not impact PAN-OS 10.2.

Scores

CVSS scores of CVE-2022-0023, by who scored it
Scored byCVSSScoreVector
palo_altoCNA (assigner)3.1Medium5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Modified3.1Medium5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.73% · top 45% of all CVEs (6 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.

Weakness

Affected products

  • Palo Alto Networks · PAN-OS

    • unaffected 10.2.*
    • affected 8.1 – < 8.1.22
    • affected 9.1 – < 9.1.13
    • affected 10.1 – < 10.1.5
    • affected 10.0 – < 10.0.10
    • affected 9.0 – < 9.0.16

  • Palo Alto Networks · Prisma Access

    • unaffected 3.0 Preferred, Innovation
    • unaffected 2.2 Preferred
    • unaffected 2.1 Preferred, Innovation

What to do

Solution: This issue is fixed in PAN-OS 8.1.22, PAN-OS 9.0.16, PAN-OS 9.1.13, PAN-OS 10.0.10, PAN-OS 10.1.5, and all later PAN-OS versions.

Workaround: Customers with a Threat Prevention subscription can block attack traffic related to this vulnerability by enabling Threat ID 92406 (Applications and Threats content update 8556). To completely mitigate the risk of this issue, temporarily disable the DNS proxy feature until you are able to upgrade your PAN-OS software to a fixed version.

Exploitation: Palo Alto Networks is not aware of any malicious exploitation of this issue.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .