CVE-2020-5938: F5 BIG-IP Access Policy Manager

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

On BIG-IP 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2, when negotiating IPSec tunnels with configured, authenticated peers, the peer may negotiate a different key length than the BIG-IP configuration would otherwise allow.

Affected products

F5 BIG-IP Access Policy Manager: from 11.6.1, up to and including 11.6.5.2; from 12.1.0, up to and including 12.1.5.2; from 13.1.0, up to and including 13.1.3.4
F5 BIG-IP Advanced Firewall Manager: from 11.6.1, up to and including 11.6.5.2; from 12.1.0, up to and including 12.1.5.2; from 13.1.0, up to and including 13.1.3.4
F5 BIG-IP Advanced Web Application Firewall: from 11.6.1, up to and including 11.6.5.2; from 12.1.0, up to and including 12.1.5.2; from 13.1.0, up to and including 13.1.3.4
F5 BIG-IP Analytics: from 11.6.1, up to and including 11.6.5.2; from 12.1.0, up to and including 12.1.5.2; from 13.1.0, up to and including 13.1.3.4
F5 BIG-IP Application Acceleration Manager: from 11.6.1, up to and including 11.6.5.2; from 12.1.0, up to and including 12.1.5.2; from 13.1.0, up to and including 13.1.3.4
F5 BIG-IP Application Security Manager: from 11.6.1, up to and including 11.6.5.2; from 12.1.0, up to and including 12.1.5.2; from 13.1.0, up to and including 13.1.3.4
F5 BIG-IP Ddos Hybrid Defender: from 11.6.1, up to and including 11.6.5.2; from 12.1.0, up to and including 12.1.5.2; from 13.1.0, up to and including 13.1.3.4
F5 BIG-IP Domain Name System: from 11.6.1, up to and including 11.6.5.2; from 12.1.0, up to and including 12.1.5.2; from 13.1.0, up to and including 13.1.3.4
F5 BIG-IP Fraud Protection Service: from 11.6.1, up to and including 11.6.5.2; from 12.1.0, up to and including 12.1.5.2; from 13.1.0, up to and including 13.1.3.4
F5 BIG-IP Global Traffic Manager: from 11.6.1, up to and including 11.6.5.2; from 12.1.0, up to and including 12.1.5.2; from 13.1.0, up to and including 13.1.3.4
F5 BIG-IP Link Controller: from 11.6.1, up to and including 11.6.5.2; from 12.1.0, up to and including 12.1.5.2; from 13.1.0, up to and including 13.1.3.4
F5 BIG-IP Local Traffic Manager: from 11.6.1, up to and including 11.6.5.2; from 12.1.0, up to and including 12.1.5.2; from 13.1.0, up to and including 13.1.3.4
F5 BIG-IP Policy Enforcement Manager: from 11.6.1, up to and including 11.6.5.2; from 12.1.0, up to and including 12.1.5.2; from 13.1.0, up to and including 13.1.3.4
F5 SSL Orchestrator: from 11.6.1, up to and including 11.6.5.2; from 12.1.0, up to and including 12.1.5.2; from 13.1.0, up to and including 13.1.3.4

Published 2020-10-29. Last modified 2026-06-17.