CVE-2025-41433: BIG-IP SIP ALG profile vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-07 · updated 2026-06-17
Weakness: CWE-476

Description

When a Session Initiation Protocol (SIP) message routing framework (MRF) application layer gateway (ALG) profile is configured on a Message Routing virtual server, undisclosed requests can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected products

F5 BIG-IP APM: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
BIG-IP: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
F5 Big-Ip Advanced Web Application Firewall: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
F5 Big-Ip Analytics: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
F5 Networks, Inc. BIG-IP (AAM): from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
BIG-IP ASM: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
F5 Big-Ip Application Visibility And Reporting: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
F5 Big-Ip Automation Toolchain: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
F5 Big-Ip Carrier-Grade Nat: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
F5 BIG-IP Container Ingress Services: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
F5 Big-Ip Ddos Hybrid Defender: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
F5 BIG-IP DNS: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
F5 Big-Ip Edge Gateway: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
F5 Big-Ip Fraud Protection Service: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
F5 Big-Ip Global Traffic Manager: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
F5 Big-Ip Link Controller: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
F5 BIG-IP (LTM): from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
F5 Networks, Inc. BIG-IP (PEM): from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
F5 Big-Ip Ssl Orchestrator: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
F5 Big-Ip Webaccelerator: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2
F5 Big-Ip Websafe: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.5; from 17.1.0 before 17.1.2 — fixed in 16.1.5, 17.1.2

How to fix

Upgrade to a fixed version: F5 BIG-IP APM 16.1.5, 17.1.2; BIG-IP 16.1.5, 17.1.2; F5 Big-Ip Advanced Web Application Firewall 16.1.5, 17.1.2; F5 Big-Ip Analytics 16.1.5, 17.1.2; F5 Networks, Inc. BIG-IP (AAM) 16.1.5, 17.1.2; BIG-IP ASM 16.1.5, 17.1.2; F5 Big-Ip Application Visibility And Reporting 16.1.5, 17.1.2; F5 Big-Ip Automation Toolchain 16.1.5, 17.1.2; F5 Big-Ip Carrier-Grade Nat 16.1.5, 17.1.2; F5 BIG-IP Container Ingress Services 16.1.5, 17.1.2; F5 Big-Ip Ddos Hybrid Defender 16.1.5, 17.1.2; F5 BIG-IP DNS 16.1.5, 17.1.2. Check the vendor advisory for mitigations.

References

https://my.f5.com/manage/s/article/K000140937

Get alerted when CVE-2025-41433 or the next vulnerability affects your stack