What’s Vulnerable › Vulnerabilities

CVE-2024-21849: BIG-IP Websockets vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-02-14 · updated 2026-06-17
• Weakness: CWE-466

Description

When an Advanced WAF/ASM security policy and a Websockets profile are configured on a virtual server, undisclosed traffic can cause the Traffic Management Microkernel (TMM) process to terminate.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected products

• F5 Big-Ip Advanced Web Application Firewall: from 16.1.0 before 16.1.4 — fixed in 16.1.4
• BIG-IP ASM: from 16.1.0 before 16.1.4 — fixed in 16.1.4

How to fix

Upgrade to a fixed version: F5 Big-Ip Advanced Web Application Firewall 16.1.4; BIG-IP ASM 16.1.4. Check the vendor advisory for mitigations.

References

• https://my.f5.com/manage/s/article/K000135873
• https://my.f5.com/manage/s/article/K000135873

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