CVE-2020-5921: F5 BIG-IP Access Policy Manager

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

in BIG-IP versions 15.1.0-15.1.0.4, 15.0.0-15.0.1.3, 14.1.0-14.1.2.6, 13.1.0-13.1.3.4, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.2, Syn flood causes large number of MCPD context messages destined to secondary blades consuming memory leading to MCPD failure. This issue affects only VIPRION hosts with two or more blades installed. Single-blade VIPRION hosts are not affected.

Affected products

• F5 BIG-IP Access Policy Manager: from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 14.1.0, before 14.1.2.7 (fixed in 14.1.2.7); from 15.0.0, before 15.0.1.4 (fixed in 15.0.1.4); from 15.1.0, before 15.1.0.5 (fixed in 15.1.0.5)
• F5 BIG-IP Advanced Firewall Manager: from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 14.1.0, before 14.1.2.7 (fixed in 14.1.2.7); from 15.0.0, before 15.0.1.4 (fixed in 15.0.1.4); from 15.1.0, before 15.1.0.5 (fixed in 15.1.0.5)
• F5 BIG-IP Analytics: from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 14.1.0, before 14.1.2.7 (fixed in 14.1.2.7); from 15.0.0, before 15.0.1.4 (fixed in 15.0.1.4); from 15.1.0, before 15.1.0.5 (fixed in 15.1.0.5)
• F5 BIG-IP Application Acceleration Manager: from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 14.1.0, before 14.1.2.7 (fixed in 14.1.2.7); from 15.0.0, before 15.0.1.4 (fixed in 15.0.1.4); from 15.1.0, before 15.1.0.5 (fixed in 15.1.0.5)
• F5 BIG-IP Application Security Manager: from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 14.1.0, before 14.1.2.7 (fixed in 14.1.2.7); from 15.0.0, before 15.0.1.4 (fixed in 15.0.1.4); from 15.1.0, before 15.1.0.5 (fixed in 15.1.0.5)
• F5 BIG-IP Domain Name System: from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 14.1.0, before 14.1.2.7 (fixed in 14.1.2.7); from 15.0.0, before 15.0.1.4 (fixed in 15.0.1.4); from 15.1.0, before 15.1.0.5 (fixed in 15.1.0.5)
• F5 BIG-IP Fraud Protection Service: from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 14.1.0, before 14.1.2.7 (fixed in 14.1.2.7); from 15.0.0, before 15.0.1.4 (fixed in 15.0.1.4); from 15.1.0, before 15.1.0.5 (fixed in 15.1.0.5)
• F5 BIG-IP Global Traffic Manager: from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 14.1.0, before 14.1.2.7 (fixed in 14.1.2.7); from 15.0.0, before 15.0.1.4 (fixed in 15.0.1.4); from 15.1.0, before 15.1.0.5 (fixed in 15.1.0.5)
• F5 BIG-IP Link Controller: from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 14.1.0, before 14.1.2.7 (fixed in 14.1.2.7); from 15.0.0, before 15.0.1.4 (fixed in 15.0.1.4); from 15.1.0, before 15.1.0.5 (fixed in 15.1.0.5)
• F5 BIG-IP Local Traffic Manager: from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 14.1.0, before 14.1.2.7 (fixed in 14.1.2.7); from 15.0.0, before 15.0.1.4 (fixed in 15.0.1.4); from 15.1.0, before 15.1.0.5 (fixed in 15.1.0.5)
• F5 BIG-IP Policy Enforcement Manager: from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 14.1.0, before 14.1.2.7 (fixed in 14.1.2.7); from 15.0.0, before 15.0.1.4 (fixed in 15.0.1.4); from 15.1.0, before 15.1.0.5 (fixed in 15.1.0.5)

Published 2020-08-26. Last modified 2026-06-17.