# CVE-2024-43451 — Microsoft Windows Server 2025 **CISA KEV** > As of 2025-10-21, CVE-2024-43451 is a MEDIUM-severity vulnerability in Microsoft Windows Server 2025, CVSS v3.1 6.5, EPSS 81.8% (99.6th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-11-12), with a US federal remediation deadline of 2024-12-03. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2024-43451, most recently “CVE-2024-43451 Windows NTLM Hash Disclosure Zero-Day Exploited In-the-Wild Against Ukrainian Entities (UAC-0194 / SparkRAT)”. **Last updated:** 2025-10-21 ## What is CVE-2024-43451? NTLM Hash Disclosure Spoofing Vulnerability The record classifies CVE-2024-43451 under weakness class [CWE-73](https://intel.threadlinqs.com/cwe/CWE-73). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality. 12 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 692 days ago. ## Severity and exploitation probability - **CVSS v3.1 base score:** 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`) - **EPSS (FIRST):** 81.8% probability of exploitation in the next 30 days, higher than 99.6% of all scored CVEs - **CISA KEV:** Listed since 2024-11-12, federal remediation deadline 2024-12-03 - **Threadlinqs priority:** 9/10 — CISA KEV-listed, which Threadlinqs floors at 9 - **Published:** 2024-11-12, last modified 2025-10-21 ## Is CVE-2024-43451 being exploited? CISA added CVE-2024-43451 to the Known Exploited Vulnerabilities catalog on 2024-11-12, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2024-12-03 under BOD 22-01. Weaponised exploit code for CVE-2024-43451 is publicly available. 2 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 43 in the Threadlinqs vulnerability feed. - [RonF98/CVE-2024-43451-POC](https://github.com/RonF98/CVE-2024-43451-POC) (github) - [trickest/cve](https://github.com/trickest/cve/blob/main/2024/CVE-2024-43451.md) (trickest) ## Affected products and versions - [Microsoft](https://intel.threadlinqs.com/vendors/microsoft): Windows Server 2025, Windows Server 2025 (Server Core installation), Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows 10 Version 21H2, Windows 11 version 22H2, Windows 10 Version 22H2, Windows 11 version 22H3, Windows 11 Version 23H2, Windows Server 2022, 23H2 Edition (Server Core installation) ## How to fix CVE-2024-43451 Because CVE-2024-43451 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2024-12-03. No vendor patch reference has been recorded for CVE-2024-43451 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise. ## Threat activity tracking CVE-2024-43451 1 tracked threat in the Threadlinqs corpus references CVE-2024-43451, either in the campaign’s CVE list or as an indicator on the campaign record. - [CVE-2024-43451 Windows NTLM Hash Disclosure Zero-Day Exploited In-the-Wild Against Ukrainian Entities (UAC-0194 / SparkRAT)](https://intel.threadlinqs.com/threat/TL-2026-0761) — HIGH · 2026-06-10 ## Sources Enriched from CVE.org, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-06-25. **Vendor advisory and patch** - [msrc.microsoft.com — vendor advisory](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-43451) Canonical: https://intel.threadlinqs.com/cve/CVE-2024-43451 Full detection coverage and IOCs for threats exploiting CVE-2024-43451 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp