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CVE-2025-53521: F5 BIG-IP Stack-Based Buffer Overflow Vulnerability

criticalknown exploitedCVE-2025-53521
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.
F5 BIG-IP APM contains a stack-based buffer overflow vulnerability that could allow a threat actor to achieve remote code execution.

CSIRTS triage

vendor: F5product: BIG-IP APMRemote code execution
What
F5 BIG-IP APM contains a stack-based buffer overflow vulnerability that could allow remote code execution.
Who is affected
Deployments of F5 BIG-IP APM.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Apply the latest security patches from F5.

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
2026-03-27
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-53521

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-2025-53521coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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