VULNERABILITY INTELLIGENCE

CVE-2021-22991

CVSS score9.8 CRITICAL
EPSS probability62.42%
CISA KEVKnown exploited vulnerability
Published2021-03-31
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Known Exploited Vulnerability

F5 BIG-IP Traffic Management Microkernel Buffer Overflow

Vendor / product: F5 / BIG-IP Traffic Management Microkernel

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.

Weakness classification

  • nvd@nist.gov: CWE-119
  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-119

Primary references