CVE-2020-5852: F5 BIG-IP Access Policy Manager

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

Undisclosed traffic patterns received may cause a disruption of service to the Traffic Management Microkernel (TMM). This vulnerability affects TMM through a virtual server configured with a FastL4 profile. Traffic processing is disrupted while TMM restarts. This issue only impacts specific engineering hotfixes. NOTE: This vulnerability does not affect any of the BIG-IP major, minor or maintenance releases you obtained from downloads.f5.com. The affected Engineering Hotfix builds are as follows: Hotfix-BIGIP-14.1.2.1.0.83.4-ENG Hotfix-BIGIP-12.1.4.1.0.97.6-ENG Hotfix-BIGIP-11.5.4.2.74.291-HF2

Affected products

F5 BIG-IP Access Policy Manager: version 11.5.4.2.74.291 only; version 12.1.4.1.0.97.6 only; version 14.1.2.1.0.83.4 only
F5 BIG-IP Advanced Firewall Manager: version 11.5.4.2.74.291 only; version 12.1.4.1.0.97.6 only; version 14.1.2.1.0.83.4 only
F5 BIG-IP Analytics: version 11.5.4.2.74.291 only; version 12.1.4.1.0.97.6 only; version 14.1.2.1.0.83.4 only
F5 BIG-IP Application Acceleration Manager: version 11.5.4.2.74.291 only; version 12.1.4.1.0.97.6 only; version 14.1.2.1.0.83.4 only
F5 BIG-IP Application Security Manager: version 11.5.4.2.74.291 only; version 12.1.4.1.0.97.6 only; version 14.1.2.1.0.83.4 only
F5 BIG-IP Domain Name System: version 11.5.4.2.74.291 only; version 12.1.4.1.0.97.6 only; version 14.1.2.1.0.83.4 only
F5 BIG-IP Edge Gateway: version 11.5.4.2.74.291 only; version 12.1.4.1.0.97.6 only; version 14.1.2.1.0.83.4 only
F5 BIG-IP Fraud Protection Service: version 11.5.4.2.74.291 only; version 12.1.4.1.0.97.6 only; version 14.1.2.1.0.83.4 only
F5 BIG-IP Global Traffic Manager: version 11.5.4.2.74.291 only; version 12.1.4.1.0.97.6 only; version 14.1.2.1.0.83.4 only
F5 BIG-IP Link Controller: version 11.5.4.2.74.291 only; version 12.1.4.1.0.97.6 only; version 14.1.2.1.0.83.4 only
F5 BIG-IP Local Traffic Manager: version 11.5.4.2.74.291 only; version 12.1.4.1.0.97.6 only; version 14.1.2.1.0.83.4 only
F5 BIG-IP Policy Enforcement Manager: version 11.5.4.2.74.291 only; version 12.1.4.1.0.97.6 only; version 14.1.2.1.0.83.4 only
F5 BIG-IP Webaccelerator: version 11.5.4.2.74.291 only; version 12.1.4.1.0.97.6 only; version 14.1.2.1.0.83.4 only

Published 2020-01-14. Last modified 2026-06-17.