CVE-2018-15311

Severity: medium (CVSS 5.9 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-10-10 · updated 2026-06-17

Description

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 APM: from 11.5.1 through 11.5.6; from 11.6.0.0 through 11.6.3.2; from 12.1.0.0 through 12.1.3.5; from 13.0.0.0 through 13.1.0.5
BIG-IP: from 11.5.1 through 11.5.6; from 11.6.0.0 through 11.6.3.2; from 12.1.0.0 through 12.1.3.5; from 13.0.0.0 through 13.1.0.5
F5 Big-Ip Analytics: from 11.5.1 through 11.5.6; from 11.6.0.0 through 11.6.3.2; from 12.1.0.0 through 12.1.3.5; from 13.0.0.0 through 13.1.0.5
F5 Networks, Inc. BIG-IP (AAM): from 11.5.1 through 11.5.6; from 11.6.0.0 through 11.6.3.2; from 12.1.0.0 through 12.1.3.5; from 13.0.0.0 through 13.1.0.5
BIG-IP ASM: from 11.5.1 through 11.5.6; from 11.6.0.0 through 11.6.3.2; from 12.1.0.0 through 12.1.3.5; from 13.0.0.0 through 13.1.0.5
F5 BIG-IP DNS: from 11.5.1 through 11.5.6; from 11.6.0.0 through 11.6.3.2; from 12.1.0.0 through 12.1.3.5; from 13.0.0.0 through 13.1.0.5
F5 Big-Ip Edge Gateway: from 11.5.1 through 11.5.6; from 11.6.0.0 through 11.6.3.2; from 12.1.0.0 through 12.1.3.5; from 13.0.0.0 through 13.1.0.5
F5 Big-Ip Fraud Protection Service: from 11.5.1 through 11.5.6; from 11.6.0.0 through 11.6.3.2; from 12.1.0.0 through 12.1.3.5; from 13.0.0.0 through 13.1.0.5
F5 Big-Ip Global Traffic Manager: from 11.5.1 through 11.5.6; from 11.6.0.0 through 11.6.3.2; from 12.1.0.0 through 12.1.3.5; from 13.0.0.0 through 13.1.0.5
F5 Big-Ip Link Controller: from 11.5.1 through 11.5.6; from 11.6.0.0 through 11.6.3.2; from 12.1.0.0 through 12.1.3.5; from 13.0.0.0 through 13.1.0.5
F5 BIG-IP (LTM): from 11.5.1 through 11.5.6; from 11.6.0.0 through 11.6.3.2; from 12.1.0.0 through 12.1.3.5; from 13.0.0.0 through 13.1.0.5
F5 Networks, Inc. BIG-IP (PEM): from 11.5.1 through 11.5.6; from 11.6.0.0 through 11.6.3.2; from 12.1.0.0 through 12.1.3.5; from 13.0.0.0 through 13.1.0.5
F5 Big-Ip Webaccelerator: from 11.5.1 through 11.5.6; from 11.6.0.0 through 11.6.3.2; from 12.1.0.0 through 12.1.3.5; from 13.0.0.0 through 13.1.0.5

References

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