CVE-2021-22981: F5 BIG-IP Access Policy Manager

Medium severity, CVSS 4.8. EPSS: 0.6% chance of exploitation in the next 30 days.

On all versions of BIG-IP 12.1.x and 11.6.x, the original TLS protocol includes a weakness in the master secret negotiation that is mitigated by the Extended Master Secret (EMS) extension defined in RFC 7627. TLS connections that do not use EMS are vulnerable to man-in-the-middle attacks during renegotiation. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.

Affected products

  • F5 BIG-IP Access Policy Manager: from 11.6.1, up to and including 11.6.5; from 12.1.0, up to and including 12.1.5
  • F5 BIG-IP Advanced Firewall Manager: from 11.6.1, up to and including 11.6.5; from 12.1.0, up to and including 12.1.5
  • F5 BIG-IP Advanced Web Application Firewall: from 11.6.1, up to and including 11.6.5; from 12.1.0, up to and including 12.1.5
  • F5 BIG-IP Analytics: from 11.6.1, up to and including 11.6.5; from 12.1.0, up to and including 12.1.5
  • F5 BIG-IP Application Acceleration Manager: from 11.6.1, up to and including 11.6.5; from 12.1.0, up to and including 12.1.5
  • F5 BIG-IP Application Security Manager: from 11.6.1, up to and including 11.6.5; from 12.1.0, up to and including 12.1.5
  • F5 BIG-IP Ddos Hybrid Defender: from 11.6.1, up to and including 11.6.5; from 12.1.0, up to and including 12.1.5
  • F5 BIG-IP Domain Name System: from 11.6.1, up to and including 11.6.5; from 12.1.0, up to and including 12.1.5
  • F5 BIG-IP Fraud Protection Service: from 11.6.1, up to and including 11.6.5; from 12.1.0, up to and including 12.1.5
  • F5 BIG-IP Global Traffic Manager: from 11.6.1, up to and including 11.6.5; from 12.1.0, up to and including 12.1.5
  • F5 BIG-IP Link Controller: from 11.6.1, up to and including 11.6.5; from 12.1.0, up to and including 12.1.5
  • F5 BIG-IP Local Traffic Manager: from 11.6.1, up to and including 11.6.5; from 12.1.0, up to and including 12.1.5
  • F5 BIG-IP Policy Enforcement Manager: from 11.6.1, up to and including 11.6.5; from 12.1.0, up to and including 12.1.5
  • F5 BIG-IP SSL Orchestrator: from 11.6.1, up to and including 11.6.5; from 12.1.0, up to and including 12.1.5

Published 2021-02-12. Last modified 2026-06-17.