CVE-2025-4275 SecureFlashDxe: Incorrect UEFI variable attributes check allows usage of invalid certificate
Attackers can bypass Secure Boot and execute arbitrary signed UEFI code by exploiting improper validation of UEFI variable attributes in InsydeH2O firmware.
- 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-2025-4275?
CVE-2025-4275 is a high-severity vulnerability in InsydeH2O, published on 11 Jun 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability in the digital signature verification process does not properly validate variable attributes which allows an attacker to bypass signature verification by creating a non-authenticated NVRAM variable. An attacker may to execute arbitrary signed UEFI code and bypass Secure Boot.
Which versions are affected by CVE-2025-4275?
How do I fix CVE-2025-4275?
No fix has been published for CVE-2025-4275 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-4275 being exploited?
There is no known exploitation of CVE-2025-4275 in the wild and no public exploit code.
Public exploit code: 3 proofs of concept on GitHub.
Sources
Also known as GHSA-v9r5-7mg9-fwrr.