CVE-2021-22991
CWE-119
103.4
RPSRPS range: 0–105; KEV-listed vulnerabilities can receive an exploitation amplifier.
Description
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 based access control or remote code execution (RCE). Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.
Source: NVD
Signals
- CVSS
- 9.8
- Critical · v3.1
- EPSS
- 61.06%
- Probability of exploitation in the next 30 days (FIRST)
- CISA KEV
- In CISA KEV since Jan 2022
- Fix commit
- No known fix commit
- Sources: MoreFixes, FreshFixes
- Weakness
- CWE-119
- Published
- 31 Mar 2021
- Last modified 27 Oct 2025
How to read these signals: RPS · EPSS · CISA KEV · Data sources
Get this score from the API
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Data as of 7 Oct 2026, 05:16 UK time