CVE-2025-12051 H2OFFT64.sys is potentially vulnerable to a buffer overflow.
A buffer overflow in InsydeH2O tools allows untrusted user-mode applications to potentially execute arbitrary code or escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-12051?
CVE-2025-12051 is a high-severity memory corruption vulnerability in InsydeH2O tools, published on 14 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The drivers in the tool packages use RTL_QUERY_REGISTRY_DIRECT flag to read a registry value to which an untrusted user-mode application may be able to cause a buffer overflow.
Weakness: CWE-787
Which versions are affected by CVE-2025-12051?
How do I fix CVE-2025-12051?
No fix has been published for CVE-2025-12051 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-12051 being exploited?
There is no known exploitation of CVE-2025-12051 in the wild and no public exploit code.
Sources
Also known as GHSA-4hgp-r52r-2m7h.