Application Level Gateway Exploit in F5 Networks' SIP Router Configuration
CVE-2025-20045

8.7HIGH

Key Information:

Vendor

F5
Status
Big-ip
Vendor
CVE Published:
5 February 2025

What is CVE-2025-20045?

A vulnerability exists in specific configurations of F5 Networks' SIP routing, where enabling the Application Level Gateway (ALG) mode with Passthru Mode can lead to unintentional termination of the Traffic Management Microkernel (TMM). This issue affects virtual servers configured for message routing and may expose the system to availability concerns due to unexpected traffic patterns. Users are advised to review their ALG settings and consider updates from F5 Networks to mitigate potential risks.

Affected Version(s)

BIG-IP 17.1.0 < 17.1.2

BIG-IP 16.1.0 < 16.1.5

BIG-IP 15.1.0

References

https://my.f5.com/manage/s/article/K000138932
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
.
CVE-2025-20045 : Application Level Gateway Exploit in F5 Networks' SIP Router Configuration