Input validation error in BIG-IP and BIG-IP APM - CVE-2025-53521
Published: March 30, 2026
Vulnerability identifier: #VU124687
CSH Severity: Critical
CVSS v4.0: 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/E:A/U:Red
CVE-ID: CVE-2025-53521
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vendor: F5 Networks
Affected software:
BIG-IP
BIG-IP APM
BIG-IP
BIG-IP APM
Detailed vulnerability description
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to insufficient validation of user-supplied input within the apmd process. A remote attacker can send specially crafted traffic to the device and execute arbitrary code.
How to mitigate CVE-2025-53521
Install updates from vendor's website.