What’s Vulnerable › Vulnerabilities

CVE-2024-52877

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-05-15 · updated 2026-06-17
• Weakness: CWE-126

Description

An issue was discovered in Insyde InsydeH2O kernel 5.2 before version 05.29.50, kernel 5.3 before version 05.38.50, kernel 5.4 before version 05.46.50, kernel 5.5 before version 05.54.50, kernel 5.6 before version 05.61.50, and kernel 5.7 before version 05.70.50. In VariableRuntimeDxe driver, callback function SmmCreateVariableLockList () calls CreateVariableLockListInSmm (). In CreateVariableLockListInSmm (), it uses StrSize () to get variable name size and it could lead to a buffer over-read.

Affected products

• Insydeh2O: from 5.2 before 5.2.05.29.50; from 5.3 before 5.3.05.38.50; from 5.4 before 5.4.05.46.50; from 5.5 before 5.5.05.54.50; from 5.6 before 5.6.05.61.50; from 5.7 before 5.7.05.70.50 — fixed in 5.2.05.29.50, 5.3.05.38.50, 5.4.05.46.50, 5.5.05.54.50, 5.6.05.61.50, 5.7.05.70.50

How to fix

Upgrade to a fixed version: Insydeh2O 5.2.05.29.50, 5.3.05.38.50, 5.4.05.46.50, 5.5.05.54.50. Check the vendor advisory for mitigations.

References

• https://www.insyde.com/security-pledge
• https://www.insyde.com/security-pledge/sa-2024016/

Get alerted when CVE-2024-52877 or the next vulnerability affects your stack