CVE-2025-4421 EfiSmiServices: gEfiSmmCpuProtocol, SMM memory corruption vulnerabilities in SMM module
Memory corruption in Lenovo's InsydeH2O SMM module allows attackers to execute arbitrary code and escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-4421?
CVE-2025-4421 is a high-severity memory corruption vulnerability in InsydeH2O, published on 30 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The vulnerability was identified in the code developed specifically for Lenovo. Please visit "Lenovo Product Security Advisories and Announcements" webpage for more information about the vulnerability. https://support.lenovo.com/us/en/product_security/home
Weakness: CWE-787
Which versions are affected by CVE-2025-4421?
How do I fix CVE-2025-4421?
No fix has been published for CVE-2025-4421 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-2025-4421 being exploited?
There is no known exploitation of CVE-2025-4421 in the wild and no public exploit code.
Sources
Also known as GHSA-39h4-c5qq-2w56.