CVE-2025-61974 BIG-IP SSL/TLS vulnerability

High 8.7 Published 15 Oct 2025 Updated 26 Feb 2026

Attackers can cause memory exhaustion and denial of service on F5 BIG-IP devices when a client SSL profile is configured on a virtual server.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-61974?

CVE-2025-61974 is a high-severity denial of service vulnerability in F5 BIG-IP, published on 15 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

When a client SSL profile is configured on a virtual server, undisclosed requests can cause an increase in memory resource utilization. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Weakness: CWE-401

Which versions are affected by CVE-2025-61974?

It affects 3 products.

Products include F5 Big-Ip Next Cloud-Native Network Functions, F5 Big-Ip Next for Kubernetes, F5 Big-Ip Next Service Proxy for Kubernetes.

How do I fix CVE-2025-61974?

No fix has been published for CVE-2025-61974 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2025-61974 being exploited?

There is no known exploitation of CVE-2025-61974 in the wild and no public exploit code.

Sources

Also known as GHSA-j8fr-j6mp-3j67.