SARA / Free Tools / CVE / CVE-2021-22991

CVE-2021-22991 — F5 BIG-IP Traffic Management Microkernel Buffer Overflow

On BIG-IP versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.2.1, 14.1.x before 14.1.4, 13.1.x before 13.1.3.6, and 12.1.x before 12.1.5.3, undisclosed requests to a virtual server may be incorrectly handled by the Traffic Management Microkernel (TMM) URI normalization, which ma

CVSS
EPSS
73.09% (top 1.20%)
CWE
Published
2021-03-31T17:23:14.000Z
Last modified
2025-10-21T23:25:50.646Z
CVSS vector
CISA KEV — Actively Exploited
Added to KEV
2022-01-18
BOD 22-01 due
2022-02-01
Ransomware use
Unknown

01What is this vulnerability?

On BIG-IP versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.2.1, 14.1.x before 14.1.4, 13.1.x before 13.1.3.6, and 12.1.x before 12.1.5.3, undisclosed requests to a virtual server may be incorrectly handled by the Traffic Management Microkernel (TMM) URI normalization, which may trigger a buffer overflow, resulting in a DoS attack. In certain situations, it may theoretically allow bypass of URL…

02Affected products

VendorProductVersions
na / BIGIP — 16.0.x before 16.0.1.1, 15.1.x before 15.1.2.1, 14.1.x before 14.1.4, 13.1.x before 13.1.3.6, 12.1.x before 12.1.5.3

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2022-01-18. Ransomware use: Unknown.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

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07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

09References

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