Traffic Management Issue in BIG-IP APM Access Policy by F5 Networks
CVE-2025-53521

8.7HIGH

Key Information:

Vendor

F5
Status
Big-ip
Vendor
CVE Published:
15 October 2025

What is CVE-2025-53521?

A configuration issue in the BIG-IP APM Access Policy may lead to unexpected traffic causing the Traffic Management Microkernel (TMM) to terminate unexpectedly. This can affect the availability of services that rely on the virtual server configured with the access policy. Users and administrators should seek to mitigate this issue by reviewing their current configurations and applying any necessary updates.

Affected Version(s)

BIG-IP 17.5.0 < 17.5.1.3

BIG-IP 17.1.0 < 17.1.3

BIG-IP 16.1.0 < 16.1.6.1

References

https://my.f5.com/manage/s/article/K000156741
vendor-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

F5
JSON
.
CVE-2025-53521 : Traffic Management Issue in BIG-IP APM Access Policy by F5 Networks