CVE-2025-5241 Denial-of-Service Vulnerability in MELSEC iQ-F Series
Remote attackers can lock out legitimate users from Mitsubishi MELSEC iQ-F PLCs by triggering the account lockout mechanism with repeated failed login attempts.
- 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-2025-5241?
CVE-2025-5241 is a medium-severity denial of service vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-CCLGN-MS, published on 11 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Overly Restrictive Account Lockout Mechanism vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series allows a remote unauthenticated attacker to lockout legitimate users for a certain period by repeatedly attempting to login with incorrect passwords. The legitimate users will be unable to login until a certain period has passed after the lockout or until the product is reset.
Weakness: CWE-645
Which versions are affected by CVE-2025-5241?
How do I fix CVE-2025-5241?
No fix has been published for CVE-2025-5241 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-2025-5241 being exploited?
There is no known exploitation of CVE-2025-5241 in the wild and no public exploit code.
Sources
Also known as GHSA-7w8q-8495-mwhj.