CVE-2025-53521
CRITICAL KEVF5 BIG-IP Access Policy Manager 15.1.0-15.1.10.8 - Remote Code Execution via Malicious Traffic
Title source: llmExploitation Summary
CVE-2025-53521 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added March 27, 2026.
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.
References (2)
Core 2
Core References
US Government Resource
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53521
Vendor Advisory vendor-advisory
https://my.f5.com/manage/s/article/K000156741
Scores
CVSS v3
9.8
EPSS
0.0877
EPSS Percentile
92.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
active
Automatable
yes
Technical Impact
total
Details
CISA KEV
2026-03-27
VulnCheck KEV
2026-03-27
ENISA EUVD
EUVD-2025-34630
CWE
CWE-121
Status
published
Products (25)
F5/BIG-IP
15.1.0 - 15.1.10.8
F5/BIG-IP
16.1.0 - 16.1.6.1
F5/BIG-IP
17.1.0 - 17.1.3
F5/BIG-IP
17.5.0 - 17.5.1.3
f5/big-ip_access_policy_manager
15.1.0 - 15.1.10.8
f5/big-ip_advanced_firewall_manager
15.1.0 - 15.1.10.8
f5/big-ip_advanced_web_application_firewall
15.1.0 - 15.1.10.8
f5/big-ip_analytics
15.1.0 - 15.1.10.8
f5/big-ip_application_acceleration_manager
15.1.0 - 15.1.10.8
f5/big-ip_application_security_manager
15.1.0 - 15.1.10.8
... and 15 more
Published
Oct 15, 2025
KEV Added
Mar 27, 2026
Tracked Since
Feb 18, 2026