CVE-2024-43451
Published: November 12, 2024
Official 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.
CISA KEV Advisory
Microsoft Windows NTLMv2 Hash Disclosure Spoofing Vulnerability
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.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Risk Analysis
Microsoft Windows contains an NTLMv2 hash spoofing vulnerability that can disclose a user's NTLMv2 hash to an attacker during a file open operation. This allows an attacker to impersonate the user. The high EPSS score of 0.89928 and its presence in CISA's KEV indicate a significant and actively exploited risk.
This vulnerability is actively exploited in the wild, as indicated by its inclusion in CISA's Known Exploited Vulnerabilities catalog.
Apply the latest security updates from Microsoft to address this NTLMv2 hash spoofing vulnerability. Implement network segmentation and restrict file share access to trusted users only.
Technical Analysis
CVE-2024-43451 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2024-43451 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (2)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2024-43451 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1