CVE-2021-22991
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.
Summary dbcve.org
A buffer overflow vulnerability in the BIG-IP Traffic Management Microkernel (TMM) URI normalization component allows specially crafted undisclosed requests to virtual servers to trigger overflow conditions, potentially causing denial of service, URL-based access control bypass, or remote code execution.
Mitigation
Apply vendor patches (16.0.1.1, 15.1.2.1, 14.1.4, 13.1.3.6, or 12.1.5.3) to all affected BIG-IP devices. Restrict external access to vulnerable virtual servers until patching is complete.