CVE-2025-4275
BaseFortify
Publication date: 2025-06-11
Last updated on: 2025-07-30
Assigner: Insyde
Description
Description
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Meta Information
Affected Vendors & Products
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
CVE-2025-4275 is a vulnerability in InsydeH2O's SecureFlashDxe component where improper validation of UEFI variable attributes during digital signature verification allows an attacker to create a non-authenticated NVRAM variable that bypasses signature verification. This lets an attacker with low privileges and local access execute arbitrary signed UEFI code, effectively bypassing Secure Boot protections. [1]
How can this vulnerability impact me? :
This vulnerability can allow an attacker with low privileges and local access to execute arbitrary signed UEFI code, bypassing Secure Boot protections. This can compromise system confidentiality, integrity, and availability, potentially allowing unauthorized code execution at a very low level in the system firmware. [1]
How can this vulnerability be detected on my network or system? Can you suggest some commands?
This vulnerability involves improper validation of UEFI variable attributes in InsydeH2O BIOS firmware, allowing execution of arbitrary signed UEFI code. Detection would require checking the BIOS version against affected InsydeH2O kernel versions (5.2 through 5.7) and verifying if the SecureFlashDxe component is vulnerable. There are no specific network detection commands provided. On the system, you can check the BIOS version and firmware kernel version to identify if it falls within the affected range. Since the vulnerability is local and requires low privileges, monitoring for unauthorized changes to UEFI variables or unexpected .efi file launches may help. However, no explicit commands are provided in the resources. [1]
What immediate steps should I take to mitigate this vulnerability?
Immediate mitigation steps include updating the InsydeH2O BIOS firmware to the fixed versions provided for each kernel: 05.2A.16 for 5.2, 05.39.16 for 5.3, 05.47.16 for 5.4, 05.55.16 for 5.5, 05.62.16 for 5.6, and 05.71.16 for 5.7. Applying these updates will correct the improper validation of UEFI variable attributes and prevent bypass of Secure Boot protections. Additionally, restrict local access to trusted users to reduce risk, as the attack requires local privileges. [1]