F5 BIG-IP Traffic Management Microkernel Buffer Overflow

Added to KEV
2022-01-18
Federal due date
2022-02-01
Vendor
F5
Product
BIG-IP Traffic Management Microkernel
EPSS
98.8th percentile (score 0.731, as of 2026-06-08)
NVD CVSS v3.1
Ransomware use
Unknown
Upstream
https://nvd.nist.gov/vuln/detail/CVE-2021-22991

CISA short description

The Traffic Management Microkernel of BIG-IP ASM Risk Engine has a buffer overflow vulnerability, leading to a bypassing of URL-based access controls.

Required action

Apply updates per vendor instructions.

EPSS percentile is the FIRST.org exploit-probability ranking as of the date noted above; it moves daily. CVSS reflects NVD's analysis at time of publication.