CVE-2021-23028 Denial of service in BIG-IP Advanced WAF and BIG-IP ASM

High 7.5 Published 14 Sep 2021 Updated 3 Aug 2024

Attackers can cause a denial of service by sending specific requests to F5 BIG-IP ASM when JSON content profiles are configured.

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-2021-23028?

CVE-2021-23028 is a high-severity denial of service vulnerability in F5 Big-Ip Advanced Web Application Firewall, published on 14 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

On version 16.0.x before 16.0.1.2, 15.1.x before 15.1.3.1, 14.1.x before 14.1.4.2, and 13.1.x before 13.1.4, when JSON content profiles are configured for URLs as part of an F5 Advanced Web Application Firewall (WAF)/BIG-IP ASM security policy and applied to a virtual server, undisclosed requests may cause the BIG-IP ASM bd process to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Weakness: CWE-20

Which versions are affected by CVE-2021-23028?

It affects 2 products.

Products include F5 Big-Ip Advanced Web Application Firewall, F5 Big-Ip Application Security Manager.

How do I fix CVE-2021-23028?

No fix has been published for CVE-2021-23028 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-2021-23028 being exploited?

There is no known exploitation of CVE-2021-23028 in the wild and no public exploit code.

All F5 Big-Ip Advanced Web Application Firewall vulnerabilities

Sources

Also known as GHSA-33v9-9rxf-3675.