CVE-2020-5876: F5 BIG-IP Access Policy Manager

High severity, CVSS 8.1. EPSS: 0.6% chance of exploitation in the next 30 days.

On BIG-IP 15.0.0-15.0.1.3, 14.1.0-14.1.2.3, 13.1.0-13.1.3.3, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.1, a race condition exists where mcpd and other processes may make unencrypted connection attempts to a new configuration sync peer. The race condition can occur when changing the ConfigSync IP address of a peer, adding a new peer, or when the Traffic Management Microkernel (TMM) first starts up.

Affected products

F5 BIG-IP Access Policy Manager: from 11.6.1, up to and including 11.6.5.1; from 12.1.0, up to and including 12.1.5.1; from 13.1.0, up to and including 13.1.3.3; from 14.1.0, up to and including 14.1.2.3; from 15.0.0, up to and including 15.1.0.3
F5 BIG-IP Advanced Firewall Manager: from 11.6.1, up to and including 11.6.5.1; from 12.1.0, up to and including 12.1.5.1; from 13.1.0, up to and including 13.1.3.3; from 14.1.0, up to and including 14.1.2.3; from 15.0.0, up to and including 15.1.0.3
F5 BIG-IP Analytics: from 11.6.1, up to and including 11.6.5.1; from 12.1.0, up to and including 12.1.5.1; from 13.1.0, up to and including 13.1.3.3; from 14.1.0, up to and including 14.1.2.3; from 15.0.0, up to and including 15.1.0.3
F5 BIG-IP Application Acceleration Manager: from 11.6.1, up to and including 11.6.5.1; from 12.1.0, up to and including 12.1.5.1; from 13.1.0, up to and including 13.1.3.3; from 14.1.0, up to and including 14.1.2.3; from 15.0.0, up to and including 15.1.0.3
F5 BIG-IP Application Security Manager: from 11.6.1, up to and including 11.6.5.1; from 12.1.0, up to and including 12.1.5.1; from 13.1.0, up to and including 13.1.3.3; from 14.1.0, up to and including 14.1.2.3; from 15.0.0, up to and including 15.1.0.3
F5 BIG-IP Domain Name System: from 11.6.1, up to and including 11.6.5.1; from 12.1.0, up to and including 12.1.5.1; from 13.1.0, up to and including 13.1.3.3; from 14.1.0, up to and including 14.1.2.3; from 15.0.0, up to and including 15.1.0.3
F5 BIG-IP Fraud Protection Service: from 11.6.1, up to and including 11.6.5.1; from 12.1.0, up to and including 12.1.5.1; from 13.1.0, up to and including 13.1.3.3; from 14.1.0, up to and including 14.1.2.3; from 15.0.0, up to and including 15.1.0.3
F5 BIG-IP Global Traffic Manager: from 11.6.1, up to and including 11.6.5.1; from 12.1.0, up to and including 12.1.5.1; from 13.1.0, up to and including 13.1.3.3; from 14.1.0, up to and including 14.1.2.3; from 15.0.0, up to and including 15.1.0.3
F5 BIG-IP Link Controller: from 11.6.1, up to and including 11.6.5.1; from 12.1.0, up to and including 12.1.5.1; from 13.1.0, up to and including 13.1.3.3; from 14.1.0, up to and including 14.1.2.3; from 15.0.0, up to and including 15.1.0.3
F5 BIG-IP Local Traffic Manager: from 11.6.1, up to and including 11.6.5.1; from 12.1.0, up to and including 12.1.5.1; from 13.1.0, up to and including 13.1.3.3; from 14.1.0, up to and including 14.1.2.3; from 15.0.0, up to and including 15.1.0.3
F5 BIG-IP Policy Enforcement Manager: from 11.6.1, up to and including 11.6.5.1; from 12.1.0, up to and including 12.1.5.1; from 13.1.0, up to and including 13.1.3.3; from 14.1.0, up to and including 14.1.2.3; from 15.0.0, up to and including 15.1.0.3

Published 2020-04-30. Last modified 2026-06-17.