CVE-2018-5504

Severity: high (CVSS 8.1 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-03-22 · updated 2026-06-17

Description

In some circumstances, the Traffic Management Microkernel (TMM) does not properly handle certain malformed Websockets requests/responses, which allows remote attackers to cause a denial-of-service (DoS) or possible remote code execution on the F5 BIG-IP system running versions 13.0.0 - 13.1.0.3 or 12.1.0 - 12.1.3.1.

Affected products

F5 BIG-IP APM: from 12.1.0 before 12.1.3.2; from 13.0.0 before 13.1.0.4 — fixed in 12.1.3.2, 13.1.0.4
BIG-IP: from 12.1.0 through 12.1.3.2; from 13.0.0 before 13.1.0.4 — fixed in 13.1.0.4
F5 Big-Ip Analytics: from 12.1.0 before 12.1.3.2; from 13.0.0 before 13.1.0.4 — fixed in 12.1.3.2, 13.1.0.4
F5 Networks, Inc. BIG-IP (AAM): from 12.1.0 before 12.1.3.2; from 13.0.0 before 13.1.0.4 — fixed in 12.1.3.2, 13.1.0.4
BIG-IP ASM: from 12.1.0 before 12.1.3.2; from 13.0.0 before 13.1.0.4 — fixed in 12.1.3.2, 13.1.0.4
F5 BIG-IP DNS: from 12.1.0 before 12.1.3.2; from 13.0.0 through 13.1.0.4 — fixed in 12.1.3.2
F5 Big-Ip Edge Gateway: from 12.1.0 before 12.1.3.2; from 13.0.0 before 13.1.0.4 — fixed in 12.1.3.2, 13.1.0.4
F5 Big-Ip Global Traffic Manager: from 12.1.0 before 12.1.3.2; from 13.0.0 before 13.1.0.4 — fixed in 12.1.3.2, 13.1.0.4
F5 Big-Ip Link Controller: from 12.1.0 before 12.1.3.2; from 13.0.0 before 13.1.0.4 — fixed in 12.1.3.2, 13.1.0.4
F5 BIG-IP (LTM): from 12.1.0 before 12.1.3.2; from 13.0.0 before 13.1.0.4 — fixed in 12.1.3.2, 13.1.0.4
F5 Networks, Inc. BIG-IP (PEM): from 12.1.0 before 12.1.3.2; from 13.0.0 before 13.1.0.4 — fixed in 12.1.3.2, 13.1.0.4
F5 Big-Ip Webaccelerator: from 12.1.0 before 12.1.3.2; from 13.0.0 before 13.1.0.4 — fixed in 12.1.3.2, 13.1.0.4
F5 Big-Ip Websafe: 1.0.0

How to fix

Upgrade to a fixed version: F5 BIG-IP APM 12.1.3.2, 13.1.0.4; BIG-IP 13.1.0.4; F5 Big-Ip Analytics 12.1.3.2, 13.1.0.4; F5 Networks, Inc. BIG-IP (AAM) 12.1.3.2, 13.1.0.4; BIG-IP ASM 12.1.3.2, 13.1.0.4; F5 BIG-IP DNS 12.1.3.2; F5 Big-Ip Edge Gateway 12.1.3.2, 13.1.0.4; F5 Big-Ip Global Traffic Manager 12.1.3.2, 13.1.0.4; F5 Big-Ip Link Controller 12.1.3.2, 13.1.0.4; F5 BIG-IP (LTM) 12.1.3.2, 13.1.0.4; F5 Networks, Inc. BIG-IP (PEM) 12.1.3.2, 13.1.0.4; F5 Big-Ip Webaccelerator 12.1.3.2, 13.1.0.4. Check the vendor advisory for mitigations.

References

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