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CVE-2025-21377 is a Windows spoofing vulnerability that can disclose a victim user's NTLMv2 authentication hash. The issue is described as stemming from external control of a file name or path and affects legacy web and scripting components used by Windows applications, including MSHTML, EdgeHTML, and related scripting platforms. A remote, unauthenticated attacker can craft a malicious file and induce limited user interaction with it, causing Windows to attempt NTLM authentication and leak the user's NTLMv2 hash to an attacker-controlled endpoint. Reported triggering conditions indicate that exploitation may occur through minimal interaction, such as selecting or inspecting the file, without requiring the victim to fully open or execute it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An NTLM hash disclosure spoofing vulnerability.
An NTLM hash disclosure spoofing vulnerability that leaks a user's NTLMv2 hash and affects MSHTML, EdgeHTML, and scripting platforms; Microsoft assesses it as more likely to be exploited soon.
Спуфинг-уязвимость в Windows, позволяющая удаленно получать NTLM-хеши пользователей.
A Windows vulnerability involving external control of file name or path that can be exploited with crafted files to obtain NTLMv2 authentication hashes.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.