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PatchSiren cyber security CVE debrief

CVE-2024-43451 Microsoft CVE debrief

CVE-2024-43451 is a Microsoft Windows issue involving NTLMv2 hash disclosure and spoofing. CISA added it to the Known Exploited Vulnerabilities catalog on 2024-11-12, which is a strong signal to prioritize remediation quickly. The CISA entry sets a remediation due date of 2024-12-03 and points operators to vendor guidance for mitigation.

Vendor
Microsoft
Product
Windows
CVSS
MEDIUM 6.5
CISA KEV
Listed
Original CVE published
2024-11-12
Original CVE updated
2024-11-12
Advisory published
2024-11-12
Advisory updated
2024-11-12

Who should care

Windows administrators, endpoint and server security teams, identity/authentication owners, and incident responders responsible for Microsoft Windows systems that use NTLM/NTLMv2.

Technical summary

The supplied sources identify CVE-2024-43451 as a Microsoft Windows NTLMv2 hash disclosure spoofing vulnerability. CISA classifies it as known exploited, so defenders should treat it as a live exposure rather than a theoretical issue. The available corpus does not provide CVSS scoring or detailed exploit mechanics, so remediation should follow Microsoft guidance and KEV prioritization.

Defensive priority

Urgent

Recommended defensive actions

  • Apply Microsoft security updates or mitigations for CVE-2024-43451 as directed by vendor guidance.
  • Prioritize all exposed Windows endpoints and servers in your remediation plan before the CISA due date of 2024-12-03.
  • If mitigations are not available for a system, follow CISA guidance to discontinue use of the product or service until it can be secured.
  • Review authentication-related telemetry and endpoint alerts for signs of abnormal NTLM activity.
  • Confirm remediation across the full Windows estate, including laptops, servers, and identity-adjacent infrastructure.

Evidence notes

CISA’s Known Exploited Vulnerabilities catalog lists this item as "Microsoft Windows NTLMv2 Hash Disclosure Spoofing Vulnerability" with dateAdded 2024-11-12 and dueDate 2024-12-03. The KEV metadata states "knownRansomwareCampaignUse: Unknown" and directs operators to apply mitigations per vendor instructions or discontinue use if mitigations are unavailable. The supplied source-item notes reference Microsoft’s MSRC update guide and the NVD detail page. The supplied CVE timeline fields show publishedAt and modifiedAt as 2024-11-12.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-43451 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-43451

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2024-43451 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-43451

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.