# CVE-2025-53521

When a BIG-IP APM access policy is configured on a virtual server, specific malicious traffic can lead to Remote Code Execution (RCE). Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

- Page: https://www.vulneraibility.com/cve/CVE-2025-53521
- CVSS: 9.8
- Known exploited: yes, in CISA KEV since 2026-03-27; CISA due date 2026-03-30
- EPSS: 2.30%
- CISA SSVC: exploitation active, automatable yes, technical impact total (assessed 2026-03-28)
- Weakness: CWE-121
- Published: 2025-10-15

## Affected versions

- F5 BIG-IP: affected >= 17.5.0 and < 17.5.1.3; >= 17.1.0 and < 17.1.3; >= 16.1.0 and < 16.1.6.1; >= 15.1.0 and < 15.1.10.8

A version outside these ranges is not a statement that it is unaffected.

## References

- [advisory] https://my.f5.com/manage/s/article/K000156741
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53521

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.