CVE-2021-23008: F5 BIG-IP Access Policy Manager

Critical severity, CVSS 9.8. EPSS: 1.3% chance of exploitation in the next 30 days.

On version 15.1.x before 15.1.3, 14.1.x before 14.1.4, 13.1.x before 13.1.4, 12.1.x before 12.1.6, and all versions of 16.0.x and 11.6.x., BIG-IP APM AD (Active Directory) authentication can be bypassed via a spoofed AS-REP (Kerberos Authentication Service Response) response sent over a hijacked KDC (Kerberos Key Distribution Center) connection or from an AD server compromised by an attacker. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected products

• F5 BIG-IP Access Policy Manager: from 11.5.2, before 11.6.5 (fixed in 11.6.5); from 12.1.0, before 12.1.5 (fixed in 12.1.5); from 13.1.0, before 13.1.3 (fixed in 13.1.3); from 14.1.0, before 14.1.3 (fixed in 14.1.3); from 15.0.0, before 15.1.2 (fixed in 15.1.2); from 16.0.0, before 16.0.1 (fixed in 16.0.1)

Published 2021-05-10. Last modified 2026-06-17.