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 Application Security Manager | >=12.1.0<=12.1.5 | |
| F5 Application Security Manager | >=13.1.0<13.1.3.6 | |
| F5 Application Security Manager | >=14.1.0<14.1.3.1 | |
| F5 Application Security Manager | >=15.1.0<15.1.2 | |
| F5 Application Security Manager | >=16.0.0<16.0.1.1 |
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Reference Links
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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- agent/references
- agent/description
- agent/event
- agent/softwarecombine
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/f5
- canonical/f5 big-ip advanced waf/asm
- version/f5 big-ip advanced waf/asm/12.1.0
- version/f5 big-ip advanced waf/asm/12.1.5
- 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 application security manager
- version/f5 application security manager/12.1.0
- version/f5 application security manager/12.1.5
- version/f5 application security manager/13.1.0
- version/f5 application security manager/14.1.0
- version/f5 application security manager/15.1.0
- version/f5 application security manager/16.0.0