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CVE-2021-22991: F5 BIG-IP Traffic Management Microkernel Buffer Overflow

criticalknown exploitedCVE-2021-22991
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
The Traffic Management Microkernel of BIG-IP ASM Risk Engine has a buffer overflow vulnerability, leading to a bypassing of URL-based access controls.

CSIRTS triage

vendor: F5product: BIG-IPOther
What
The Traffic Management Microkernel of BIG-IP ASM Risk Engine has a buffer overflow vulnerability.
Who is affected
Deployments of F5 BIG-IP are affected.
Urgency
Remediation is urgent as the vulnerability is actively exploited and critical.
Action
Apply the latest security updates for F5 BIG-IP.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-01-18
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-22991

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-22991coverage & exploitation statusNVD · CVE.org

Recent advisories for F5 BIG-IP Traffic

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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