CVE-2021-22976: High severity F5 Big-ip Advanced Web Application Firewall vulnerability
On BIG-IP Advanced WAF and ASM version 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 13.1.3.6, and all 12.1.x versions, when the BIG-IP ASM system processes WebSocket requests with JSON payloads, an unusually large number of parameters can cause excessive CPU usage in the BIG-IP ASM bd process. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2021-22976?
The severity of CVE-2021-22976 is classified as a medium risk vulnerability.
How do I fix CVE-2021-22976?
To fix CVE-2021-22976, upgrade to the latest version of BIG-IP Advanced WAF/ASM or BIG-IP Application Security Manager as specified in the security advisory.
What products are affected by CVE-2021-22976?
CVE-2021-22976 affects various versions of F5 BIG-IP Advanced WAF, ASM, and Application Security Manager including versions prior to 12.1.5.
What kind of attack does CVE-2021-22976 enable?
CVE-2021-22976 can enable a denial-of-service attack by causing excessive CPU resource usage when processing WebSocket requests with large JSON payloads.
When was CVE-2021-22976 published?
CVE-2021-22976 was published in March 2021.