CVE-2021-22991
CVSS v3
9.8
CRITICAL
EPSS Score
73.1 %
exploit probability
CISA KEV
Yes
known exploited
Exploitation
—
SSVC status
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.
CISA Known Exploited Vulnerability
- Date Added
- 2022-01-18
- Patch Due Date
- 2022-02-01
- Ransomware Use
- Unknown
Technical details
- Published
- 2021-03-31
Frequently asked questions
What is CVE-2021-22991?
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.
Is CVE-2021-22991 actively exploited?
Yes. CVE-2021-22991 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-02-01.
What is the CVSS score for CVE-2021-22991?
CVE-2021-22991 has a CVSS v3 base score of 9.8 (CRITICAL severity).
Is CVE-2021-22991 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.
No credit card required · 500 free checks/month · Free API key
Other 2021 vulnerabilities worth triaging
Ranked by exploit probability (EPSS).