SB2025011478 - Multiple vulnerabilities in Microsoft Windows CSC Service

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Out-of-bounds read (CVE-ID: CVE-2025-21374)

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in Windows CSC Service. A local user can trigger an out-of-bounds read error and read contents of memory on the system.

2) Heap-based buffer overflow (CVE-ID: CVE-2025-21378)

The vulnerability allows a local user to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in Windows CSC Service. A local user can pass specially crafted data to the application, trigger a heap-based buffer overflow and execute arbitrary code on the target system with elevated privileges.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-21374
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-21378