January 18, 2022 · Applied Cybernetics Group
CVE-2021-22991 — F5 BIG-IP Traffic Management Microkernel
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.