Microsoft Windows Cryptographic Services Remote Code Execution Vulnerability

A remote code execution vulnerability has been identified in Windows Cryptographic Services. This issue arises from a missing release of memory after its effective lifetime, allowing an unauthorized attacker to execute code over a network. The vulnerability affects multiple Windows products, including Windows Server 2025, Windows 11 (various versions and architectures), and Windows Server 2022.

Impact

Exploitation of this vulnerability allows for remote code execution on the affected system.

Reproduction

To exploit this vulnerability, an attacker can send malicious fragmented ClientHello messages to a server that accepts Transport Layer Security (TLS) connections. This process takes advantage of the memory management flaw, potentially leading to unauthorized code execution.

Remediation

Users can apply the security updates provided by Microsoft to address this vulnerability. These security updates are available through the Microsoft Update Catalog.