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CVE-2021-22991: F5 BIG-IP Traffic Management Microkernel Buffer Overflow
F5 BIG-IP Traffic Management Microkernel · in CISA KEV since 2022-01-18
2022-01-18added to KEV
2022-02-01federal remediation due date
61.06%EPSS exploit probability (30 days) 99.1th percentile
9.8 CRITICALCVSS 3.1
Unknownknown ransomware use
293days from NVD publication to KEV
What it is
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 (CISA)
Apply updates per vendor instructions.
| CWE | CWE-119 |
|---|---|
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD published | 2021-03-31 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2021-22991.json · all KEV CVEs
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Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.