CVE-2025-53521

BigIP APM Vulnerability

State: Published
Severity: 9.3 Critical
Published: Oct 15, 2025
Updated: Mar 31, 2026
Reserved: Oct 3, 2025

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	f5
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	f5

Weaknesses

CWE-121 Stack-based Buffer Overflow

Affected Products

Product	Versions
BIG-IPF5	17.5.0 to before 17.5.1.3Affected 17.1.0 to before 17.1.3Affected 16.1.0 to before 16.1.6.1Affected 15.1.0 to before 15.1.10.8Affected

References

https://my.f5.com/manage/s/article/K000156741vendor-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53521government-resource

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.