CVE-2025-61951: BIG-IP DTLS 1.2 Vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-15 · updated 2026-10-08
Weakness: CWE-125

Description

Undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate. This issue may occur when a Datagram Transport Layer Security (DTLS) 1.2 virtual server is enabled with a Server SSL profile that is configured with a certificate, key, and the SSL Sign Hash set to ANY, and the backend server is enabled with DTLS 1.2 and client authentication. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected products

F5 BIG-IP APM: from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
BIG-IP: from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
F5 Big-Ip Advanced Web Application Firewall: from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
F5 Big-Ip Analytics: from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
F5 Networks, Inc. BIG-IP (AAM): from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
BIG-IP ASM: from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
F5 Big-Ip Application Visibility And Reporting: from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
F5 Big-Ip Automation Toolchain: from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
F5 Big-Ip Carrier-Grade Nat: from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
F5 BIG-IP Container Ingress Services: from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
F5 Big-Ip Ddos Hybrid Defender: from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
F5 BIG-IP DNS: from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
F5 Big-Ip Edge Gateway: from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
F5 Big-Ip Fraud Protection Service: from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
F5 Big-Ip Global Traffic Manager: from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
F5 Big-Ip Link Controller: from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
F5 BIG-IP (LTM): from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
F5 Networks, Inc. BIG-IP (PEM): from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
F5 Big-Ip Ssl Orchestrator: from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
F5 Big-Ip Webaccelerator: from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3
F5 Big-Ip Websafe: from 16.1.0 before 16.1.6.1; from 17.1.0 before 17.1.3; 17.5.0 — fixed in 16.1.6.1, 17.1.3

How to fix

Upgrade to a fixed version: F5 BIG-IP APM 16.1.6.1, 17.1.3; BIG-IP 16.1.6.1, 17.1.3; F5 Big-Ip Advanced Web Application Firewall 16.1.6.1, 17.1.3; F5 Big-Ip Analytics 16.1.6.1, 17.1.3; F5 Networks, Inc. BIG-IP (AAM) 16.1.6.1, 17.1.3; BIG-IP ASM 16.1.6.1, 17.1.3; F5 Big-Ip Application Visibility And Reporting 16.1.6.1, 17.1.3; F5 Big-Ip Automation Toolchain 16.1.6.1, 17.1.3; F5 Big-Ip Carrier-Grade Nat 16.1.6.1, 17.1.3; F5 BIG-IP Container Ingress Services 16.1.6.1, 17.1.3; F5 Big-Ip Ddos Hybrid Defender 16.1.6.1, 17.1.3; F5 BIG-IP DNS 16.1.6.1, 17.1.3. Check the vendor advisory for mitigations.

References

https://my.f5.com/manage/s/article/K000151309

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