CVE-2025-21311CriticalCVSS 9.8
Windows NTLM V1 Elevation of Privilege Vulnerability
🔗 CVE IDs covered (1)
📋 Description
According to the CVSS metric, the attack vector is network (AV:N) and the attack complexity is low (AC:L). What does that mean for this vulnerability? The attack vector is Network (AV:N) because this vulnerability is remotely exploitable and can be exploited from the internet. The attack complexity is Low (AC:L) because an attacker does not require significant prior knowledge of the system and can achieve repeatable success with the payload against the vulnerable component.
🎯 Affected products5
- Windows 11 Version 24H2 for ARM64-based Systems
- Windows 11 Version 24H2 for x64-based Systems
- Windows Server 2022, 23H2 Edition (Server Core installation)
- Windows Server 2025
- Windows Server 2025 (Server Core installation)
✅ Remediation
KB5050009 (Security Update) — fixed build 10.0.26100.2894 KB5049984 (Security Update) — fixed build 10.0.25398.1369
🔗 References (5)
- advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21311
- patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5050009
- referencehttps://support.microsoft.com/help/5050009
- patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5049984
- referencehttps://support.microsoft.com/help/5049984