# CVE-2025-53778: Windows NTLM Elevation of Privilege Vulnerability

CVE-2025-53778 is fixed in 37 products on 1 platform, first by KB5063871, released August 12, 2025. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2025-53778
- Priority: Urgent
- CVSS: 8.8 (Critical)
- EPSS: 0.5162
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation More Likely
- Published: Aug 12, 2025
- Weakness: Improper Authentication
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53778

## Description

<p>Improper authentication in Windows NTLM allows an authorized attacker to elevate privileges over a network.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1607 for 32-bit Systems | 14393.8330 | [KB5063871](https://patchblox.com/security/data/fix/microsoft/kb5063871.md) | Aug 12, 2025 |
| Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.8330 | [KB5063871](https://patchblox.com/security/data/fix/microsoft/kb5063871.md) | Aug 12, 2025 |
| Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.7678 | [KB5063877](https://patchblox.com/security/data/fix/microsoft/kb5063877.md) | Aug 12, 2025 |
| Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.7678 | [KB5063877](https://patchblox.com/security/data/fix/microsoft/kb5063877.md) | Aug 12, 2025 |
| Microsoft | Windows 10 Version 21H2 for 32-bit Systems |  | [KB5063709](https://patchblox.com/security/data/fix/microsoft/kb5063709.md) | Aug 12, 2025 |
| Microsoft | Windows 10 Version 21H2 for ARM64-based Systems |  | [KB5063709](https://patchblox.com/security/data/fix/microsoft/kb5063709.md) | Aug 12, 2025 |
| Microsoft | Windows 10 Version 21H2 for x64-based Systems |  | [KB5063709](https://patchblox.com/security/data/fix/microsoft/kb5063709.md) | Aug 12, 2025 |
| Microsoft | Windows 10 Version 22H2 for 32-bit Systems |  | [KB5063709](https://patchblox.com/security/data/fix/microsoft/kb5063709.md) | Aug 12, 2025 |
| Microsoft | Windows 10 Version 22H2 for ARM64-based Systems |  | [KB5063709](https://patchblox.com/security/data/fix/microsoft/kb5063709.md) | Aug 12, 2025 |
| Microsoft | Windows 10 Version 22H2 for x64-based Systems |  | [KB5063709](https://patchblox.com/security/data/fix/microsoft/kb5063709.md) | Aug 12, 2025 |
| Microsoft | Windows 10 for 32-bit Systems | 10240.21100 | [KB5063889](https://patchblox.com/security/data/fix/microsoft/kb5063889.md) | Aug 12, 2025 |
| Microsoft | Windows 10 for x64-based Systems | 10240.21100 | [KB5063889](https://patchblox.com/security/data/fix/microsoft/kb5063889.md) | Aug 12, 2025 |
| Microsoft | Windows 11 Version 22H2 for ARM64-based Systems |  | [KB5063875](https://patchblox.com/security/data/fix/microsoft/kb5063875.md) | Aug 12, 2025 |
| Microsoft | Windows 11 Version 22H2 for x64-based Systems |  | [KB5063875](https://patchblox.com/security/data/fix/microsoft/kb5063875.md) | Aug 12, 2025 |
| Microsoft | Windows 11 Version 23H2 for ARM64-based Systems |  | [KB5063875](https://patchblox.com/security/data/fix/microsoft/kb5063875.md) | Aug 12, 2025 |
| Microsoft | Windows 11 Version 23H2 for x64-based Systems |  | [KB5063875](https://patchblox.com/security/data/fix/microsoft/kb5063875.md) | Aug 12, 2025 |
| Microsoft | Windows 11 Version 24H2 for ARM64-based Systems | 26100.4946 | [KB5063878](https://patchblox.com/security/data/fix/microsoft/kb5063878.md) | Aug 12, 2025 |
| Microsoft | Windows 11 Version 24H2 for ARM64-based Systems | 26100.4851 | [KB5064010](https://patchblox.com/security/data/fix/microsoft/kb5064010.md) | Aug 12, 2025 |
| Microsoft | Windows 11 Version 24H2 for x64-based Systems | 26100.4946 | [KB5063878](https://patchblox.com/security/data/fix/microsoft/kb5063878.md) | Aug 12, 2025 |
| Microsoft | Windows 11 Version 24H2 for x64-based Systems | 26100.4851 | [KB5064010](https://patchblox.com/security/data/fix/microsoft/kb5064010.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 |  | [KB5063927](https://patchblox.com/security/data/fix/microsoft/kb5063927.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 |  | [KB5063947](https://patchblox.com/security/data/fix/microsoft/kb5063947.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) |  | [KB5063927](https://patchblox.com/security/data/fix/microsoft/kb5063927.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) |  | [KB5063947](https://patchblox.com/security/data/fix/microsoft/kb5063947.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 |  | [KB5063948](https://patchblox.com/security/data/fix/microsoft/kb5063948.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 |  | [KB5063888](https://patchblox.com/security/data/fix/microsoft/kb5063888.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) |  | [KB5063948](https://patchblox.com/security/data/fix/microsoft/kb5063948.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) |  | [KB5063888](https://patchblox.com/security/data/fix/microsoft/kb5063888.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 |  | [KB5063948](https://patchblox.com/security/data/fix/microsoft/kb5063948.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 |  | [KB5063888](https://patchblox.com/security/data/fix/microsoft/kb5063888.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) |  | [KB5063948](https://patchblox.com/security/data/fix/microsoft/kb5063948.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) |  | [KB5063888](https://patchblox.com/security/data/fix/microsoft/kb5063888.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2012 |  | [KB5063906](https://patchblox.com/security/data/fix/microsoft/kb5063906.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2012 (Server Core installation) |  | [KB5063906](https://patchblox.com/security/data/fix/microsoft/kb5063906.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2012 R2 |  | [KB5063950](https://patchblox.com/security/data/fix/microsoft/kb5063950.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB5063950](https://patchblox.com/security/data/fix/microsoft/kb5063950.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2016 | 14393.8330 | [KB5063871](https://patchblox.com/security/data/fix/microsoft/kb5063871.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2016 (Server Core installation) | 14393.8330 | [KB5063871](https://patchblox.com/security/data/fix/microsoft/kb5063871.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2019 | 17763.7678 | [KB5063877](https://patchblox.com/security/data/fix/microsoft/kb5063877.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2019 (Server Core installation) | 17763.7678 | [KB5063877](https://patchblox.com/security/data/fix/microsoft/kb5063877.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2022 | 20348.4052 | [KB5063880](https://patchblox.com/security/data/fix/microsoft/kb5063880.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2022 | 20348.3989 | [KB5063812](https://patchblox.com/security/data/fix/microsoft/kb5063812.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2022 (Server Core installation) | 20348.4052 | [KB5063880](https://patchblox.com/security/data/fix/microsoft/kb5063880.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2022 (Server Core installation) | 20348.3989 | [KB5063812](https://patchblox.com/security/data/fix/microsoft/kb5063812.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 25398.1791 | [KB5063899](https://patchblox.com/security/data/fix/microsoft/kb5063899.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2025 | 26100.4946 | [KB5063878](https://patchblox.com/security/data/fix/microsoft/kb5063878.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2025 | 26100.4851 | [KB5064010](https://patchblox.com/security/data/fix/microsoft/kb5064010.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2025 (Server Core installation) | 26100.4946 | [KB5063878](https://patchblox.com/security/data/fix/microsoft/kb5063878.md) | Aug 12, 2025 |
| Microsoft | Windows Server 2025 (Server Core installation) | 26100.4851 | [KB5064010](https://patchblox.com/security/data/fix/microsoft/kb5064010.md) | Aug 12, 2025 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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