CVE-2021-22975 Denial of service in BIG-IP

High 7.5 Published 12 Feb 2021 Updated 3 Aug 2024

Attackers can cause a denial of service by triggering a Traffic Management Microkernel restart through large traffic bursts on affected BIG-IP systems.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-22975?

CVE-2021-22975 is a high-severity denial of service vulnerability in F5 Big-Ip Access Policy Manager, published on 12 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

On BIG-IP version 16.0.x before 16.0.1.1, 15.1.x before 15.1.2.1, and 14.1.x before 14.1.3.1, under some circumstances, Traffic Management Microkernel (TMM) may restart on the BIG-IP system while passing large bursts of traffic. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.

Which versions are affected by CVE-2021-22975?

It affects 14 products.

Products include F5 Big-Ip Access Policy Manager, F5 Big-Ip Advanced Firewall Manager, F5 Big-Ip Advanced Web Application Firewall, F5 Big-Ip Analytics, F5 Big-Ip Application Acceleration Manager, F5 Big-Ip Application Security Manager and 8 more.

How do I fix CVE-2021-22975?

No fix has been published for CVE-2021-22975 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-22975 being exploited?

There is no known exploitation of CVE-2021-22975 in the wild and no public exploit code.

All F5 Big-Ip Access Policy Manager vulnerabilities

Sources

Also known as GHSA-jjmf-rvpm-r6pc.