What is CVE-2022-0023?

CVE-2022-0023 is a medium-severity vulnerability in Palo Alto Networks Pan-Os, classified under Improper Handling of Exceptional Conditions. CVSS score: 5.9/10. Published 2022-04-13.

How severe is CVE-2022-0023?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Is CVE-2022-0023 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Palo Alto Networks Pan-Os

CVE-2022-0023

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.

Published 2022-04-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (52.6th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: +0.000

Affected products

Palo Alto Networks Pan-Os — versions 10.2.*, 8.1, 9.1
Palo Alto Networks Prisma Access — versions 3.0 Preferred, Innovation, 2.2 Preferred, 2.1 Preferred, Innovation
Paloaltonetworks Pan-Os

Weakness classification (CWE)

CWE-755 — Improper Handling of Exceptional Conditions

Public proof-of-concept exploits

karimhabush/cyberowl

References

security.paloaltonetworks.com/CVE-2022-0023 (Vendor Advisory)

Frequently asked questions

What is CVE-2022-0023?: CVE-2022-0023 is a medium-severity vulnerability in Palo Alto Networks Pan-Os, classified under Improper Handling of Exceptional Conditions. CVSS score: 5.9/10. Published 2022-04-13.
How severe is CVE-2022-0023?: Medium severity. CVSS v3 base score is 5.9 out of 10.
Is CVE-2022-0023 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.