CVE-2018-5506: F5 BIG-IP Access Policy Manager

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

In F5 BIG-IP 13.0.0, 12.1.0-12.1.2, 11.6.1, 11.5.1-11.5.5, or 11.2.1 the Apache modules apache_auth_token_mod and mod_auth_f5_auth_token.cpp allow possible unauthenticated bruteforce on the em_server_ip authorization parameter to obtain which SSL client certificates used for mutual authentication between BIG-IQ or Enterprise Manager (EM) and managed BIG-IP devices.

Affected products

F5 BIG-IP Access Policy Manager: from 11.5.1, up to and including 11.5.5; from 12.1.0, up to and including 12.1.3.1; version 11.2.1 only; version 11.6.1 only; version 13.0.0 only
F5 BIG-IP Advanced Firewall Manager: from 11.5.1, up to and including 11.5.5; from 12.1.0, up to and including 12.1.3.1; version 11.2.1 only; version 11.6.1 only; version 13.0.0 only
F5 BIG-IP Analytics: from 11.5.1, up to and including 11.5.5; from 12.1.0, up to and including 12.1.3.1; version 11.2.1 only; version 11.6.1 only; version 13.0.0 only
F5 BIG-IP Application Acceleration Manager: from 11.5.1, up to and including 11.5.5; from 12.1.0, up to and including 12.1.3.1; version 11.2.1 only; version 11.6.1 only; version 13.0.0 only
F5 BIG-IP Application Security Manager: from 11.5.1, up to and including 11.5.5; from 12.1.0, up to and including 12.1.3.1; version 11.2.1 only; version 11.6.1 only; version 13.0.0 only
F5 BIG-IP Domain Name System: from 11.5.1, up to and including 11.5.5; from 12.1.0, up to and including 12.1.3.1; version 11.2.1 only; version 11.6.1 only; version 13.0.0 only
F5 BIG-IP Edge Gateway: from 11.5.1, up to and including 11.5.5; from 12.1.0, up to and including 12.1.3.1; version 11.2.1 only; version 11.6.1 only; version 13.0.0 only
F5 BIG-IP Global Traffic Manager: from 11.5.1, up to and including 11.5.5; from 12.1.0, up to and including 12.1.3.1; version 11.2.1 only; version 11.6.1 only; version 13.0.0 only
F5 BIG-IP Link Controller: from 11.5.1, up to and including 11.5.5; from 12.1.0, up to and including 12.1.3.1; version 11.2.1 only; version 11.6.1 only; version 13.0.0 only
F5 BIG-IP Local Traffic Manager: from 11.5.1, up to and including 11.5.5; from 12.1.0, up to and including 12.1.3.1; version 11.2.1 only; version 11.6.1 only; version 13.0.0 only
F5 BIG-IP Policy Enforcement Manager: from 11.5.1, up to and including 11.5.5; from 12.1.0, up to and including 12.1.3.1; version 11.2.1 only; version 11.6.1 only; version 13.0.0 only
F5 BIG-IP Webaccelerator: from 11.5.1, up to and including 11.5.5; from 12.1.0, up to and including 12.1.3.1; version 11.2.1 only; version 11.6.1 only; version 13.0.0 only
F5 BIG-IP Websafe: from 11.5.1, up to and including 11.5.5; from 12.1.0, up to and including 12.1.3.1; version 11.2.1 only; version 11.6.1 only; version 13.0.0 only

Published 2018-04-13. Last modified 2026-06-17.