CVE-2025-55670 BIG-IP Next (CNF, SPK, and Kubernetes) vulnerability
Repeated API calls can cause the Traffic Management Microkernel to terminate, leading to a denial of service on BIG-IP Next systems.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-55670?
CVE-2025-55670 is a high-severity denial of service vulnerability in F5 BIG-IP Next CNF, published on 15 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
On BIG-IP Next CNF, BIG-IP Next SPK, and BIG-IP Next for Kubernetes systems, repeated undisclosed API calls can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Weakness: CWE-770
Which versions are affected by CVE-2025-55670?
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-2025-55670?
No fix has been published for CVE-2025-55670 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-2025-55670 being exploited?
There is no known exploitation of CVE-2025-55670 in the wild and no public exploit code.
Other vulnerabilities in F5 BIG-IP Next CNF
Sources
Also known as GHSA-jrj4-84w3-hw4h.