CVE-2020-5947: F5 BIG-IP Access Policy Manager

Medium severity, CVSS 4.3. EPSS: 0.7% chance of exploitation in the next 30 days.

In versions 16.0.0-16.0.0.1 and 15.1.0-15.1.1, on specific BIG-IP platforms, attackers may be able to obtain TCP sequence numbers from the BIG-IP system that can be reused in future connections with the same source and destination port and IP numbers. Only these platforms are affected: BIG-IP 2000 series (C112), BIG-IP 4000 series (C113), BIG-IP i2000 series (C117), BIG-IP i4000 series (C115), BIG-IP Virtual Edition (VE).

Affected products

  • F5 BIG-IP Access Policy Manager: from 15.0.0, before 15.1.2 (fixed in 15.1.2); from 16.0.0, before 16.0.1 (fixed in 16.0.1)
  • F5 BIG-IP Advanced Firewall Manager: from 15.0.0, before 15.1.2 (fixed in 15.1.2); from 16.0.0, before 16.0.1 (fixed in 16.0.1)
  • F5 BIG-IP Advanced Web Application Firewall: from 15.0.0, before 15.1.2 (fixed in 15.1.2); from 16.0.0, before 16.0.1 (fixed in 16.0.1)
  • F5 BIG-IP Analytics: from 15.0.0, before 15.1.2 (fixed in 15.1.2); from 16.0.0, before 16.0.1 (fixed in 16.0.1)
  • F5 BIG-IP Application Acceleration Manager: from 15.0.0, before 15.1.2 (fixed in 15.1.2); from 16.0.0, before 16.0.1 (fixed in 16.0.1)
  • F5 BIG-IP Application Security Manager: from 15.0.0, before 15.1.2 (fixed in 15.1.2); from 16.0.0, before 16.0.1 (fixed in 16.0.1)
  • F5 BIG-IP Ddos Hybrid Defender: from 15.0.0, before 15.1.2 (fixed in 15.1.2); from 16.0.0, before 16.0.1 (fixed in 16.0.1)
  • F5 BIG-IP Domain Name System: from 15.0.0, before 15.1.2 (fixed in 15.1.2); from 16.0.0, before 16.0.1 (fixed in 16.0.1)
  • F5 BIG-IP Fraud Protection Service: from 15.0.0, before 15.1.2 (fixed in 15.1.2); from 16.0.0, before 16.0.1 (fixed in 16.0.1)
  • F5 BIG-IP Global Traffic Manager: from 15.0.0, up to and including 15.1.2; from 16.0.0, before 16.0.1 (fixed in 16.0.1)
  • F5 BIG-IP Link Controller: from 15.0.0, before 15.1.2 (fixed in 15.1.2); from 16.0.0, before 16.0.1 (fixed in 16.0.1)
  • F5 BIG-IP Local Traffic Manager: from 15.0.0, before 15.1.2 (fixed in 15.1.2); from 16.0.0, before 16.0.1 (fixed in 16.0.1)
  • F5 BIG-IP Policy Enforcement Manager: from 15.0.0, before 15.1.2 (fixed in 15.1.2); from 16.0.0, before 16.0.1 (fixed in 16.0.1)
  • F5 SSL Orchestrator: from 15.0.0, before 15.1.2 (fixed in 15.1.2); from 16.0.0, before 16.0.1 (fixed in 16.0.1)

Published 2020-11-19. Last modified 2026-06-17.