Privilege escalation in Insyde H2O UEFI



Risk Low
Patch available NO
Number of vulnerabilities 1
CVE-ID CVE-2025-4275
CWE-ID CWE-749
Exploitation vector Local
Public exploit N/A
Vulnerable software
 InsydeH2O Kernel
Hardware solutions / Firmware

Vendor Insyde Software

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Exposed dangerous method or function

EUVDB-ID: #VU110699

Risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-4275

CWE-ID: CWE-749 - Exposed Dangerous Method or Function

Exploit availability: No

Description

The vulnerability allows an attacker to escalate privileges on the system.

The vulnerability exists due to usage of an unprotected NVRAM variable. An attacker with physical access to the system can inject their own certificate in this variable and subsequently run arbitrary firmware (signed by the injected certificate) during the early boot process within the UEFI environment.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

InsydeH2O Kernel: All versions

CPE2.3 External links

https://www.kb.cert.org/vuls/id/211341


Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



###SIDEBAR###