CVE-2021-23013 Denial of service in BIG-IP

High 7.5 Published 10 May 2021 Updated 3 Aug 2024

Attackers can cause the Traffic Management Microkernel to stop responding by sending specific SCTP traffic to a configured virtual server.

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-2021-23013?

CVE-2021-23013 is a high-severity denial of service vulnerability in F5 Big-Ip Access Policy Manager, published on 10 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

On BIG-IP versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.3, 14.1.x before 14.1.4, 13.1.x before 13.1.3.6, and 12.1.x before 12.1.5.3, the Traffic Management Microkernel (TMM) may stop responding when processing Stream Control Transmission Protocol (SCTP) traffic under certain conditions. This vulnerability affects TMM by way of a virtual server configured with an SCTP profile. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Which versions are affected by CVE-2021-23013?

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-2021-23013?

No fix has been published for CVE-2021-23013 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-2021-23013 being exploited?

There is no known exploitation of CVE-2021-23013 in the wild and no public exploit code.

All F5 Big-Ip Access Policy Manager vulnerabilities

Sources

Also known as GHSA-8hjr-xh25-fxcr.