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Micropatchers share 1-instruction fix for NTLM hash leak flaw in Windows 7+

ID: f0889347-ca16-583a-9ad8-5628b330a86a

STIX ID: report--f0889347-ca16-583a-9ad8-5628b330a86a

Feed Name: The Register (Security)

Threat Score
65/100

Date Published: 2024-12-06

Date Updated: 2026-04-26

Author: Iain Thomson

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Acros Security disclosed an unpatched NTLM vulnerability affecting Windows 7 through Windows 11 and Server equivalents that can leak users' NTLM hashes when a malicious file is viewed in Windows Explorer; Acros will supply a temporary one-instruction micropatch while Microsoft investigates and there are no confirmed in-the-wild attacks reported.

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