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Vulnerabilities

Vulnerability · CVE-2025-4275

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

Published Jun 11, 2025 · catalog updated Aug 14, 2025 · Insyde Software InsydeH2O

Check if you run it

No confirmed exploitation is on record for CVE-2025-4275. EPSS is 0.48%. Act only if a listed version of Insyde Software InsydeH2O is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.48%
Remediation
Version ranges on file
Affected products
vendor Insyde Software InsydeH2O Kernel 5.7 <05.71.16

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Insyde Software InsydeH2O Kernel 5.7 <05.71.16Kernel 5.7 <05.71.16

How to fix CVE-2025-4275

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-4275. EPSS is 0.48%. Act only if a listed version of Insyde Software InsydeH2O is installed.

Which versions are affected?

Compare what you have installed with Insyde Software InsydeH2O Kernel 5.7 <05.71.16 Kernel 5.7 <05.71.16. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.48%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 11, 2025 · EUVD

    Detected

    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.

  2. Aug 14, 2025 · EUVD

    Updated

    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

  • CVE.orgVulnerability recordCVE-2025-4275

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-4275

    30-day exploitation probability 0.5%

    first.org
  • EUVDVulnerability recordEUVD-2025-18070

    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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.