CVE-2025-55669 BIG-IP HTTP/2 vulnerability
Attackers can cause a denial of service by sending undisclosed traffic to BIG-IP systems with specific WAF and HTTP/2 configurations.
- 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-2025-55669?
CVE-2025-55669 is a high-severity denial of service vulnerability in F5 Big-Ip Application Security Manager, 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 the BIG-IP Advanced WAF and ASM security policy and a server-side HTTP/2 profile are configured on a virtual server, undisclosed traffic 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-672
Which versions are affected by CVE-2025-55669?
It affects 1 product.
Products include F5 Big-Ip Application Security Manager.
How do I fix CVE-2025-55669?
No fix has been published for CVE-2025-55669 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-2025-55669 being exploited?
There is no known exploitation of CVE-2025-55669 in the wild and no public exploit code.
Other vulnerabilities in F5 Big-Ip Application Security Manager
Sources
Also known as GHSA-5r25-m2h9-w299.