CVE-2025-4275
SecureFlashDxe: Incorrect UEFI variable attributes check allows usage of invalid certificate
- Published
- Jun 11, 2025
- Updated
- Aug 14, 2025
- Assigning CNA
- Insyde
- Evidence observed
- Aug 5, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:HLow · next 30 days
- Percentile
- 37.5%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
1- Hydroph0biaPoC
Binaries, drivers, PoCs and other stuff on Hydroph0bia vulnerability (CVE-2025-4275)
Responsible use
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