CVE-2025-5514 Denial-of-Service(DoS) Vulnerability in Web server function on MELSEC iQ-F Series CPU module
Remote attackers can cause denial of service on Mitsubishi MELSEC iQ-F PLCs by sending crafted HTTP requests to the web 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-2025-5514?
CVE-2025-5514 is a medium-severity denial of service vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MR/DS, published on 25 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Improper Handling of Length Parameter Inconsistency vulnerability in web server function on Mitsubishi Electric Corporation MELSEC iQ-F Series CPU module allows a remote unauthenticated attacker to delay the processing of the web server function and prevent legitimate users from utilizing the web server function, by sending a specially crafted HTTP request.
Weakness: CWE-130
Which versions are affected by CVE-2025-5514?
How do I fix CVE-2025-5514?
No fix has been published for CVE-2025-5514 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-2025-5514 being exploited?
There is no known exploitation of CVE-2025-5514 in the wild and no public exploit code.
Sources
Also known as GHSA-hqhx-rf6h-xj5g.