CVE-2018-15311: F5 BIG-IP Access Policy Manager

Medium severity, CVSS 5.9. EPSS: 1.4% chance of exploitation in the next 30 days.

When F5 BIG-IP 13.0.0-13.1.0.5, 12.1.0-12.1.3.5, 11.6.0-11.6.3.2, or 11.5.1-11.5.6 is processing specially crafted TCP traffic with the Large Receive Offload (LRO) feature enabled, TMM may crash, leading to a failover event. This vulnerability is not exposed unless LRO is enabled, so most affected customers will be on 13.1.x. LRO has been available since 11.4.0 but is not enabled by default until 13.1.0.

Affected products

F5 BIG-IP Access Policy Manager: from 11.5.1, up to and including 11.5.6; from 11.6.0.0, up to and including 11.6.3.2; from 12.1.0.0, up to and including 12.1.3.5; from 13.0.0.0, up to and including 13.1.0.5
F5 BIG-IP Advanced Firewall Manager: from 11.5.1, up to and including 11.5.6; from 11.6.0.0, up to and including 11.6.3.2; from 12.1.0.0, up to and including 12.1.3.5; from 13.0.0.0, up to and including 13.1.0.5
F5 BIG-IP Analytics: from 11.5.1, up to and including 11.5.6; from 11.6.0.0, up to and including 11.6.3.2; from 12.1.0.0, up to and including 12.1.3.5; from 13.0.0.0, up to and including 13.1.0.5
F5 BIG-IP Application Acceleration Manager: from 11.5.1, up to and including 11.5.6; from 11.6.0.0, up to and including 11.6.3.2; from 12.1.0.0, up to and including 12.1.3.5; from 13.0.0.0, up to and including 13.1.0.5
F5 BIG-IP Application Security Manager: from 11.5.1, up to and including 11.5.6; from 11.6.0.0, up to and including 11.6.3.2; from 12.1.0.0, up to and including 12.1.3.5; from 13.0.0.0, up to and including 13.1.0.5
F5 BIG-IP Domain Name System: from 11.5.1, up to and including 11.5.6; from 11.6.0.0, up to and including 11.6.3.2; from 12.1.0.0, up to and including 12.1.3.5; from 13.0.0.0, up to and including 13.1.0.5
F5 BIG-IP Edge Gateway: from 11.5.1, up to and including 11.5.6; from 11.6.0.0, up to and including 11.6.3.2; from 12.1.0.0, up to and including 12.1.3.5; from 13.0.0.0, up to and including 13.1.0.5
F5 BIG-IP Fraud Protection Service: from 11.5.1, up to and including 11.5.6; from 11.6.0.0, up to and including 11.6.3.2; from 12.1.0.0, up to and including 12.1.3.5; from 13.0.0.0, up to and including 13.1.0.5
F5 BIG-IP Global Traffic Manager: from 11.5.1, up to and including 11.5.6; from 11.6.0.0, up to and including 11.6.3.2; from 12.1.0.0, up to and including 12.1.3.5; from 13.0.0.0, up to and including 13.1.0.5
F5 BIG-IP Link Controller: from 11.5.1, up to and including 11.5.6; from 11.6.0.0, up to and including 11.6.3.2; from 12.1.0.0, up to and including 12.1.3.5; from 13.0.0.0, up to and including 13.1.0.5
F5 BIG-IP Local Traffic Manager: from 11.5.1, up to and including 11.5.6; from 11.6.0.0, up to and including 11.6.3.2; from 12.1.0.0, up to and including 12.1.3.5; from 13.0.0.0, up to and including 13.1.0.5
F5 BIG-IP Policy Enforcement Manager: from 11.5.1, up to and including 11.5.6; from 11.6.0.0, up to and including 11.6.3.2; from 12.1.0.0, up to and including 12.1.3.5; from 13.0.0.0, up to and including 13.1.0.5
F5 BIG-IP Webaccelerator: from 11.5.1, up to and including 11.5.6; from 11.6.0.0, up to and including 11.6.3.2; from 12.1.0.0, up to and including 12.1.3.5; from 13.0.0.0, up to and including 13.1.0.5

Published 2018-10-10. Last modified 2026-06-17.