CVE-2018-5507: F5 BIG-IP Access Policy Manager

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

On F5 BIG-IP versions 13.0.0, 12.1.0-12.1.3.1, 11.6.1-11.6.2, or 11.5.1-11.5.5, vCMP guests running on VIPRION 2100, 4200 and 4300 series blades cannot correctly decrypt ciphertext from established SSL sessions with small MTU.

Affected products

  • F5 BIG-IP Access Policy Manager: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 13.0.0 only
  • F5 BIG-IP Advanced Firewall Manager: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 13.0.0 only
  • F5 BIG-IP Analytics: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 13.0.0 only
  • F5 BIG-IP Application Acceleration Manager: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 13.0.0 only
  • F5 BIG-IP Application Security Manager: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 13.0.0 only
  • F5 BIG-IP Domain Name System: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 13.0.0 only
  • F5 BIG-IP Edge Gateway: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 13.0.0 only
  • F5 BIG-IP Global Traffic Manager: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 13.0.0 only
  • F5 BIG-IP Link Controller: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 13.0.0 only
  • F5 BIG-IP Local Traffic Manager: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 13.0.0 only
  • F5 BIG-IP Policy Enforcement Manager: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 13.0.0 only
  • F5 BIG-IP Webaccelerator: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 13.0.0 only
  • F5 BIG-IP Websafe: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 13.0.0 only

Published 2018-04-13. Last modified 2026-06-17.