CVE-2021-22976

HIGH

7.5

CVSS Score

Published: February 12, 2021 at 05:43 PM UTC

Updated: June 17, 2026 at 03:38 AM UTC

2 products affected across 1 vendorBig IP Application Security ManagerBig IP Advanced Web Application Firewall

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Severity

HIGH7.5

Exploit prediction

EPSS 1.0%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Big IP Advanced Web Application Firewall · F5

95%

12.1.0 ≤ v ≤ 12.1.513.1.0 ≤ v < 13.1.3.614.1.0 ≤ v < 14.1.3.115.1.0 ≤ v < 15.1.216.0 ≤ v < 16.0.1.116.0.0 ≤ v < 16.0.1.1

Affected range stops below 13.1.3.6, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.1.3.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 15.1.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 16.0.1.1, so it looks safe — our inference, not a vendor statement

Big IP Application Security Manager · F5

95%

12.1.0 ≤ v ≤ 12.1.513.1.0 ≤ v < 13.1.3.614.1.0 ≤ v < 14.1.3.115.1.0 ≤ v < 15.1.216.0 ≤ v < 16.0.1.116.0.0 ≤ v < 16.0.1.1

Affected range stops below 13.1.3.6, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.1.3.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 15.1.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 16.0.1.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

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

References (1)

x_refsource_MISCVendor Advisory

Source: [email protected]

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

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

NVD-CWE-Other

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