CVE-2021-23010 Denial of service in BIG-IP ASM/Advanced WAF

What is CVE-2021-23010?

CVE-2021-23010 is a high-severity denial of service vulnerability in F5 Big-Ip Application Security 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 versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.2, 14.1.x before 14.1.3.1, 13.1.x before 13.1.3.5, and 12.1.x before 12.1.5.3, when the BIG-IP ASM/Advanced WAF system processes WebSocket requests with JSON payloads using the default JSON Content Profile in the ASM Security Policy, the BIG-IP ASM bd process may produce a core file. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Which versions are affected by CVE-2021-23010?

It affects 1 product.

Products include F5 Big-Ip Application Security Manager.

How do I fix CVE-2021-23010?

No fix has been published for CVE-2021-23010 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-2021-23010 being exploited?

There is no known exploitation of CVE-2021-23010 in the wild and no public exploit code.

Other vulnerabilities in F5 Big-Ip Application Security Manager

• CVE-2019-6665 Other in BIG-IP ASM Critical 9.4
• CVE-2019-6650 Information disclosure in BIG-IP ASM Critical 9.1
• CVE-2025-24326 BIG-IP Advanced WAF/ASM BADoS vulnerability High 8.9
• CVE-2025-55669 BIG-IP HTTP/2 vulnerability High 8.7
• CVE-2009-4420 Memory corruption in n/a High 7.8

All F5 Big-Ip Application Security Manager vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-x9xh-v7jc-6xqh.