CVE-2022-0023: Palo Alto Networks PAN-OS

Medium severity, CVSS 5.9. EPSS: 0.7% chance of exploitation in the next 30 days.

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.

Affected products

• Palo Alto Networks PAN-OS: from 8.1.0, before 8.1.22 (fixed in 8.1.22); from 9.0.0, before 9.0.16 (fixed in 9.0.16); from 9.1.0, before 9.1.13 (fixed in 9.1.13); from 10.0.0, before 10.0.10 (fixed in 10.0.10); from 10.1.0, before 10.1.5 (fixed in 10.1.5)

Published 2022-04-13. Last modified 2026-06-17.