CVE-2020-2002: Palo Alto Networks PAN-OS

High severity, CVSS 8.1. EPSS: 1.3% chance of exploitation in the next 30 days.

An authentication bypass by spoofing vulnerability exists in the authentication daemon and User-ID components of Palo Alto Networks PAN-OS by failing to verify the integrity of the Kerberos key distribution center (KDC) before authenticating users. This affects all forms of authentication that use a Kerberos authentication profile. A man-in-the-middle type of attacker with the ability to intercept communication between PAN-OS and KDC can login to PAN-OS as an administrator. This issue affects: PAN-OS 7.1 versions earlier than 7.1.26; PAN-OS 8.1 versions earlier than 8.1.13; PAN-OS 9.0 versions earlier than 9.0.6; All version of PAN-OS 8.0.

Affected products

• Palo Alto Networks PAN-OS: from 7.1.0, before 7.1.26 (fixed in 7.1.26); from 8.0.0, up to and including 8.0.20; from 8.1.0, before 8.1.13 (fixed in 8.1.13); from 9.0.0, before 9.0.6 (fixed in 9.0.6)

Published 2020-05-13. Last modified 2026-06-17.