Is CVE-2021-22976 in the CISA KEV catalog?

No. CVE-2021-22976 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-22976?

CVE-2021-22976 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-22976?

CVE-2021-22976 has an EPSS score of 0.96% (57th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-22976?

Upgrade big-ip advanced web application firewall to 16.0.1.1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-22976

HIGH

7.5

CVSS v3

NVD

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.

How to fix

Remediation Available

big-ip advanced web application firewallNVD

Affected:>= 16.0.0, < 16.0.1.1Fixed in:16.0.1.1CVE-2021-22976derived from NVD

big-ip application security managerNVD

Affected:>= 16.0.0, < 16.0.1.1Fixed in:16.0.1.1CVE-2021-22976derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.96%probability of exploitation in 30 days

57thpercentile

Moderate risk: more likely to be exploited than 57% of all known CVEs.

References

Vendor Advisory1

support.f5.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.