NTLMv2 hash disclosure in Microsoft Windows MSHTML component



| Updated: 2025-03-10
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2025-21377
CWE-ID CWE-200
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Microsoft Internet Explorer
Client/Desktop applications / Web browsers

Windows
Operating systems & Components / Operating system

Windows Server
Operating systems & Components / Operating system

Vendor Microsoft

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Information disclosure

EUVDB-ID: #VU103774

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-21377

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to NTLMv2 hash disclosure within the MSHTML component. A remote attacker can trick the victim into clicking on a specially crafted link and obtain the NTLMv2 hash.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Internet Explorer: - - 11.1790.17763.0

Windows: 10 21H2 10.0.19041.3920 - 11 24H2 10.0.26100.2894

Windows Server: 2008 R2 6.1.7601.27067 - 2025 10.0.26100.2894

CPE2.3 External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-21377


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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