CVE-2020-5931

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-10-29 · updated 2026-06-17

Description

On BIG-IP 15.1.0-15.1.0.5, 14.1.0-14.1.2.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2, Virtual servers with a OneConnect profile may incorrectly handle WebSockets related HTTP response headers, causing TMM to restart.

Affected products

F5 BIG-IP APM: from 11.6.1 through 11.6.5.2; from 12.1.0 through 12.1.5.2; from 13.1.0 through 13.1.3.4; from 14.0.0 before 14.1.2.5; from 15.0.0 before 15.1.1 — fixed in 14.1.2.5, 15.1.1
BIG-IP: from 11.6.1 through 11.6.5.2; from 12.1.0 through 12.1.5.2; from 13.1.0 through 13.1.3.4; from 14.0.0 before 14.1.2.5; from 15.0.0 before 15.1.1 — fixed in 14.1.2.5, 15.1.1
F5 Big-Ip Analytics: from 11.6.1 through 11.6.5.2; from 12.1.0 through 12.1.5.2; from 13.1.0 through 13.1.3.4; from 14.0.0 before 14.1.2.5; from 15.0.0 before 15.1.1 — fixed in 14.1.2.5, 15.1.1
F5 Networks, Inc. BIG-IP (AAM): from 11.6.1 through 11.6.5.2; from 12.1.0 through 12.1.5.2; from 13.1.0 through 13.1.3.4; from 14.0.0 before 14.1.2.5; from 15.0.0 before 15.1.1 — fixed in 14.1.2.5, 15.1.1
BIG-IP ASM: from 11.6.1 through 11.6.5.2; from 12.1.0 through 12.1.5.2; from 13.1.0 through 13.1.3.4; from 14.0.0 before 14.1.2.5; from 15.0.0 before 15.1.1 — fixed in 14.1.2.5, 15.1.1
F5 BIG-IP DNS: from 11.6.1 through 11.6.5.2; from 12.1.0 through 12.1.5.2; from 13.1.0 through 13.1.3.4; from 14.0.0 before 14.1.2.5; from 15.0.0 before 15.1.1 — fixed in 14.1.2.5, 15.1.1
F5 Big-Ip Fraud Protection Service: from 11.6.1 through 11.6.5.2; from 12.1.0 through 12.1.5.2; from 13.1.0 through 13.1.3.4; from 14.0.0 before 14.1.2.5; from 15.0.0 before 15.1.1 — fixed in 14.1.2.5, 15.1.1
F5 Big-Ip Global Traffic Manager: from 11.6.1 through 11.6.5.2; from 12.1.0 through 12.1.5.2; from 13.1.0 through 13.1.3.4; from 14.0.0 before 14.1.2.5; from 15.0.0 before 15.1.1 — fixed in 14.1.2.5, 15.1.1
F5 Big-Ip Link Controller: from 11.6.1 through 11.6.5.2; from 12.1.0 through 12.1.5.2; from 13.1.0 through 13.1.3.4; from 14.0.0 before 14.1.2.5; from 15.0.0 before 15.1.1 — fixed in 14.1.2.5, 15.1.1
F5 BIG-IP (LTM): from 11.5.2 through 11.6.5.2; from 12.1.0 through 12.1.5.2; from 13.1.0 through 13.1.3.4; from 14.0.0 before 14.1.2.5; from 15.0.0 before 15.1.1 — fixed in 14.1.2.5, 15.1.1
F5 Networks, Inc. BIG-IP (PEM): from 11.6.1 through 11.6.5.2; from 12.1.0 through 12.1.5.2; from 13.1.0 through 13.1.3.4; from 14.0.0 before 14.1.2.5; from 15.0.0 before 15.1.1 — fixed in 14.1.2.5, 15.1.1

How to fix

Upgrade to a fixed version: F5 BIG-IP APM 14.1.2.5, 15.1.1; BIG-IP 14.1.2.5, 15.1.1; F5 Big-Ip Analytics 14.1.2.5, 15.1.1; F5 Networks, Inc. BIG-IP (AAM) 14.1.2.5, 15.1.1; BIG-IP ASM 14.1.2.5, 15.1.1; F5 BIG-IP DNS 14.1.2.5, 15.1.1; F5 Big-Ip Fraud Protection Service 14.1.2.5, 15.1.1; F5 Big-Ip Global Traffic Manager 14.1.2.5, 15.1.1; F5 Big-Ip Link Controller 14.1.2.5, 15.1.1; F5 BIG-IP (LTM) 14.1.2.5, 15.1.1; F5 Networks, Inc. BIG-IP (PEM) 14.1.2.5, 15.1.1. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2020-5931 or the next vulnerability affects your stack