CVE-2025-61938 BIG-IP Advanced WAF and ASM bd process vulnerability

High 8.7 Published 15 Oct 2025 Updated 26 Feb 2026

Attackers can cause repeated termination of the bd process in F5 BIG-IP WAF/ASM by configuring long URLs in Data Guard Protection Enforcement settings.

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-2025-61938?

CVE-2025-61938 is a high-severity denial of service vulnerability in F5 Big-Ip Advanced Web Application Firewall, 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 BIG-IP Advanced WAF or ASM security policy is configured with a URL greater than 1024 characters in length for the Data Guard Protection Enforcement setting, either manually or through the automatic Policy Builder, the bd process can terminate repeatedly. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Weakness: CWE-1284

Which versions are affected by CVE-2025-61938?

It affects 2 products.

Products include F5 Big-Ip Advanced Web Application Firewall, F5 Big-Ip Application Security Manager.

How do I fix CVE-2025-61938?

No fix has been published for CVE-2025-61938 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-2025-61938 being exploited?

There is no known exploitation of CVE-2025-61938 in the wild and no public exploit code.

All F5 Big-Ip Advanced Web Application Firewall vulnerabilities

Sources

Also known as GHSA-88f3-qp5h-cw8h.