by Kastro
Paper/Archive/CVE-2021-22991

CVE-2021-22991

F5 BIG-IP Traffic Management Microkernel — F5 BIG-IP Traffic Management Microkernel Buffer Overflow

KEV · due 1 FebEPSS 62%public exploitSSVC actCVSS 9.8
critical.is priorityof 100
99
CVSS 9.8 (ADP)9.8 / 10 × 3029.4In CISA KEV+3030.0EPSS percentile 99.2.992 × 2019.8Exploit: SSVC active+1010.0SSVC exploitation: active+1010.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
BIG-IP16.0.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, 12.1.x before 12.1.5.3–CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: active · Automatable: yes · Technical impact: total

References

refsupport.f5.com/csp/article/K56715231refcisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22991kevcisa.gov/known-exploited-vulnerabilities-catalog