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CVE-2024-43451

Exploitation: active CVSS 6.5 MEDIUM

CVSS base score: 6.5 (Medium) vendor CNA · v3.1

Score assigned by the vendor's own CVE Numbering Authority (CNA); CISA's Vulnrichment program adds a score only when the CNA omits one.

Microsoft Windows NTLMv2 Hash Disclosure Spoofing Vulnerability

Vendor: Microsoft   Product: Windows

Description

Microsoft Windows contains an NTLMv2 hash spoofing vulnerability that could result in disclosing a user's NTLMv2 hash to an attacker via a file open operation. The attacker could then leverage this hash to impersonate that user.

Lifecycle Timeline

Each milestone comes from a different source, so gaps between them are gaps in what those sources publish, not evidence that nothing happened. EPSS history for this CVE holds 109 points from 2024-11-16, tracked daily from 2026-09-09; earlier points are weekly, which dates a spike to within a week. Peak probability 91.1% on 2025-05-10.

Published Applicability

CVE List v5 (CNA container) 24 affected · 0 fixed · 0 not affected

Check whether a specific version is affected →

What each source publishes about which product versions carry this vulnerability, kept as written rather than merged. Absence here means no source has published applicability data, not that nothing is affected.

Research & News Coverage

No mentions found in monitored research blogs or news feeds.

Detection & Exploitation

Exploit / Pen Test
Host / SIEM
none published

Coverage across public collections only: Nuclei and OpenVAS NVT (scan); Snort and Suricata ET Open (network); Sigma and YARA (host/SIEM); Metasploit, Exploit-DB and public GitHub repositories (exploit). Absence here means nothing public was found, not that detection is impossible.
GitHub PoC repositories are collected automatically by PoC-in-GitHub (CC0) and are not vetted: some are fakes and some are malware. Treat them as evidence that code was published, not as code to run.
OpenVAS coverage derives from the Greenbone Community Feed, made available under the Open Database License (ODbL) v1.0; its individual Vulnerability Tests are licensed GNU GPL v2.

Microsoft Assessment

published by the affected vendor via MSRC

NTLM Hash Disclosure Spoofing Vulnerability

Exploitation Detected
Yes
Yes
Important
Spoofing
Windows NTLM
2024-11-12

The vendor's own judgement about their own code, shown alongside CISA's rather than merged into it. The exploitability index is a forward-looking prediction, distinct from a CVSS severity or CISA's SSVC decision, and vendors often report observed exploitation before a CVE reaches the KEV catalog. Vendor advisory →

CISA Assessment (Vulnrichment / SSVC)

active
no
partial
—
6.5 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C
CWE-73 — External Control of File Name or Path
2024-11-13

KEV Catalog Status

2024-11-12
2024-12-03
Unknown

Listed By

SourceDateRecord
CISA KEV 2024-11-12 source record →
CISA Vulnrichment 2024-11-13 source record →

Referenced in Advisories

DateAdvisoryIssuer
2024-11-13 2024-116: Microsoft November 2024 Patch Tuesday CERT-EU

Weaponization Timeline — Offensive & Testing Tools

No exploit-tool sightings recorded for this CVE.

Evidence tiers are explained on the About page — a merged Metasploit module is far stronger evidence than a distro package mention.

External References