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.

Vulnerability/
CVE-2021-22976

high

7.5

12/2/2021

12/7/2022

CVE-2021-22976

First published: Fri Feb 12 2021(Updated: )

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.

Credit: f5sirt@f5.com

Affected Software	Affected Version	How to fix
F5 BIG-IP Advanced WAF/ASM	>=12.1.0<=12.1.5
F5 BIG-IP Advanced WAF/ASM	>=13.1.0<13.1.3.6
F5 BIG-IP Advanced WAF/ASM	>=14.1.0<14.1.3.1
F5 BIG-IP Advanced WAF/ASM	>=15.1.0<15.1.2
F5 BIG-IP Advanced WAF/ASM	>=16.0.0<16.0.1.1
F5 BIG-IP Application Security Manager	>=12.1.0<=12.1.5
F5 BIG-IP Application Security Manager	>=13.1.0<13.1.3.6
F5 BIG-IP Application Security Manager	>=14.1.0<14.1.3.1
F5 BIG-IP Application Security Manager	>=15.1.0<15.1.2
F5 BIG-IP Application Security Manager	>=16.0.0<16.0.1.1

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Reference Links

https://support.f5.com/csp/article/K88230177

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.

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vendor/f5
canonical/f5 big-ip advanced waf/asm
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version/f5 big-ip advanced waf/asm/13.1.0
version/f5 big-ip advanced waf/asm/14.1.0
version/f5 big-ip advanced waf/asm/15.1.0
version/f5 big-ip advanced waf/asm/16.0.0
canonical/f5 big-ip application security manager
version/f5 big-ip application security manager/12.1.0
version/f5 big-ip application security manager/12.1.5
version/f5 big-ip application security manager/13.1.0
version/f5 big-ip application security manager/14.1.0
version/f5 big-ip application security manager/15.1.0
version/f5 big-ip application security manager/16.0.0

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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.