F5 BIG-IP Traffic Management Microkernel Buffer Overflow (CVE-2021-22991)
Severity: critical · Patch status: patched · Since 2022-01-18 · CVE-2021-22991
The Traffic Management Microkernel of BIG-IP ASM Risk Engine has a buffer overflow vulnerability, leading to a bypassing of URL-based access controls. CISA added CVE-2021-22991 to its Known Exploited Vulnerabilities catalog on Jan 18, 2022, which means attackers are exploiting it in the wild.
What to do
- Apply updates per vendor instructions.
- US federal agencies must remediate by Feb 1, 2022 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
