CVE-2021-22991
F5 BIG-IP Traffic Management Microkernel Buffer Overflow
IN CISA KEV
The Traffic Management Microkernel of BIG-IP ASM Risk Engine has a buffer overflow vulnerability, leading to a bypassing of URL-based access controls.
- Vendor
- F5
- Product
- BIG-IP Traffic Management Microkernel
- CVSS
- No score recorded (no NVD record loaded for this entry)
- CWE
- CWE-119
- Published
- Not recorded
- NVD modified
- Not recorded
CISA KEV
- Date added
- 2022-01-18
- Due date
- 2022-02-01
- Ransomware use
- Unknown
- Required action
- Apply updates per vendor instructions.
EPSS
61.1% chance of exploitation in the next 30 days (percentile 99th)
FIRST EPSS, updated 17 Oct 2026. About EPSS
CVSS is severity, EPSS is likelihood, KEV means already exploited. EPSS is a statistical probability, not a certainty: a low score does not make a bug safe, and a high one does not prove it is being exploited.
Data last updated 18 Oct 2026. Sources: NVD API 2.0, CISA KEV catalog, FIRST EPSS. Links: NVD, CISA KEV. Metadata only. ThreatWire does not host exploit code.