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CVE-2021-22976

HIGHCVSS 7.5/10EPSS 0.96%

Last modified

CVE-2021-22976 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 0.96% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
0.96%

57.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
F5Big-Ip Advanced Web Application Firewall>= 12.1.0, <= 12.1.5
F5Big-Ip Advanced Web Application Firewall>= 13.1.0, < 13.1.3.6
F5Big-Ip Advanced Web Application Firewall>= 14.1.0, < 14.1.3.1
F5Big-Ip Advanced Web Application Firewall>= 15.1.0, < 15.1.2
F5Big-Ip Advanced Web Application Firewall>= 16.0.0, < 16.0.1.1
F5Big-Ip Application Security Manager>= 12.1.0, <= 12.1.5
F5Big-Ip Application Security Manager>= 13.1.0, < 13.1.3.6
F5Big-Ip Application Security Manager>= 14.1.0, < 14.1.3.1
F5Big-Ip Application Security Manager>= 15.1.0, < 15.1.2
F5Big-Ip Application Security Manager>= 16.0.0, < 16.0.1.1

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-22976?
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.
How severe is CVE-2021-22976?
CVE-2021-22976 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.96% probability of exploitation in the next 30 days.
How do I fix CVE-2021-22976?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-22976?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST