Microsoft Windows NTLM Hash Disclosure Spoofing Vulnerability
CVE-2024-43451 is a Microsoft Windows NTLM hash disclosure spoofing vulnerability in which Windows handling of malicious Internet Shortcut/.url files can trigger outbound SMB authentication to an attacker-controlled server with only minimal user interaction. Reported trigger conditions include selecting, right-clicking, inspecting, dragging, deleting, or otherwise interacting with the malicious file without opening or executing it. The issue can disclose the victim user's NTLMv2 hash to a remote attacker via a file open/shell interaction path. Multiple reports describe the flaw as affecting Windows processing of .url/network shortcut files and causing SMB-based authentication leakage when Explorer or related shell components resolve the crafted shortcut target.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
28 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A prior NTLM hash disclosure spoofing vulnerability referenced as a predecessor to CVE-2025-24054 and noted as exploited in real attacks.
An NTLM-related vulnerability referenced as an example of an NTLM flaw impacting 2025 (no technical details provided in the content).
A vulnerability in Microsoft Windows NTLM protocol, abused by threat actors for credential theft and post-exploitation activities.
A vulnerability in Windows MSHTML allows .url files to trigger NTLMv2 hash leaks with minimal user interaction, enabling credential theft and lateral movement. Exploited in the wild by APTs and cybercriminals for malware delivery and credential compromise.
The version that knows your environment.
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.