CVE-2018-5501: F5 BIG-IP Access Policy Manager

Medium severity, CVSS 5.9. EPSS: 1.3% chance of exploitation in the next 30 days.

In some circumstances, on F5 BIG-IP systems running 13.0.0, 12.1.0 - 12.1.3.1, any 11.6.x or 11.5.x release, or 11.2.1, TCP DNS profile allows excessive buffering due to lack of flow control.

Affected products

  • F5 BIG-IP Access Policy Manager: from 11.5.1, up to and including 11.5.4; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 11.2.1 only; version 13.0.0 only
  • F5 BIG-IP Advanced Firewall Manager: from 11.5.1, up to and including 11.5.4; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 11.2.1 only; version 13.0.0 only
  • F5 BIG-IP Analytics: from 11.5.1, up to and including 11.5.4; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 11.2.1 only; version 13.0.0 only
  • F5 BIG-IP Application Acceleration Manager: from 11.5.1, up to and including 11.5.4; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 11.2.1 only; version 13.0.0 only
  • F5 BIG-IP Application Security Manager: from 11.5.1, up to and including 11.5.4; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 11.2.1 only; version 13.0.0 only
  • F5 BIG-IP DNS: from 11.5.1, up to and including 11.5.4; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 11.2.1 only; version 13.0.0 only
  • F5 BIG-IP Edge Gateway: from 11.5.1, up to and including 11.5.4; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 11.2.1 only; version 13.0.0 only
  • F5 BIG-IP Global Traffic Manager: from 11.5.1, up to and including 11.5.4; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 11.2.1 only; version 13.0.0 only
  • F5 BIG-IP Link Controller: from 11.5.1, up to and including 11.5.4; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 11.2.1 only; version 13.0.0 only
  • F5 BIG-IP Local Traffic Manager: from 11.5.1, up to and including 11.5.4; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 11.2.1 only; version 13.0.0 only
  • F5 BIG-IP Policy Enforcement Manager: from 11.5.1, up to and including 11.5.4; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 11.2.1 only; version 13.0.0 only
  • F5 BIG-IP Webaccelerator: from 11.5.1, up to and including 11.5.4; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 11.2.1 only; version 13.0.0 only
  • F5 BIG-IP Websafe: from 11.5.1, up to and including 11.5.4; from 11.6.1, up to and including 11.6.2; from 12.1.0, up to and including 12.1.3; version 11.2.1 only; version 13.0.0 only

Published 2018-03-01. Last modified 2026-06-17.