Critical NTLMv2 Hash Disclosure Vulnerability in Windows 10 Version 22H2 (CVE Pending)

Critical NTLMv2 Hash Disclosure Flaw Identified in Windows 10 Version 22H2

Security researchers have disclosed a critical vulnerability in Microsoft Windows 10 version 19045 (22H2) that enables NTLMv2 hash disclosure, potentially allowing attackers to steal credentials and move laterally within compromised networks. The exploit, published on Exploit Database (EDB-ID: 52415), highlights a significant risk for enterprises relying on Windows 10 environments.

Technical Details of the Vulnerability

The flaw involves the improper handling of NTLMv2 authentication responses, which could allow an attacker to capture hashed credentials in transit. NTLMv2 (NT LAN Manager version 2) is a challenge-response authentication protocol used in Windows environments for network authentication. If exploited, this vulnerability could enable:

• Credential theft via man-in-the-middle (MITM) attacks or rogue servers
• Pass-the-hash attacks, bypassing password requirements
• Lateral movement within a network after initial compromise

At the time of disclosure, no CVE ID has been assigned to this vulnerability. However, security teams are advised to monitor Microsoft’s security advisories for updates and patches.

Impact Analysis

The NTLMv2 hash disclosure flaw poses a high risk to organizations, particularly those with:

• Legacy systems still relying on NTLM authentication
• Unpatched Windows 10 version 19045 (22H2) deployments
• Misconfigured network security policies allowing NTLM traffic

Successful exploitation could lead to privilege escalation, data breaches, or full domain compromise if combined with other attack techniques. Enterprises should assess their exposure and prioritize mitigation efforts.

Recommendations for Security Teams

To mitigate risks associated with this vulnerability, security professionals should:

1. Disable NTLM authentication where possible and enforce Kerberos as the primary authentication protocol.
2. Apply Microsoft’s latest security updates once a patch is released for Windows 10 version 19045.
3. Monitor network traffic for unusual NTLM authentication attempts using SIEM or EDR solutions.
4. Implement SMB signing to prevent relay attacks targeting NTLM hashes.
5. Conduct a security audit to identify systems still using NTLM and migrate them to modern authentication methods.

Security teams are urged to review the exploit code (EDB-ID: 52415) and test their environments for susceptibility. Microsoft has not yet issued an official advisory, but proactive measures can reduce exposure to this critical flaw.