# CVE-2025-24052: Windows Agere Modem Driver Elevation of Privilege Vulnerability CVE-2025-24052 is fixed in 26 products on 1 platform, first by KB5066836, released October 14, 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-2025-24052 - Priority: Urgent - CVSS: 7.8 (Important) - EPSS: 0.0254 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: yes - Vendor exploitability assessment: Exploitation More Likely - Published: Oct 14, 2025 - Weakness: Stack-based Buffer Overflow - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-24052 ## Description

Microsoft is aware of vulnerabilities in the third party Agere Modem driver that ships natively with supported Windows operating systems. This is an announcement of the upcoming removal of ltmdm64.sys driver. The driver has been removed in the October cumulative update.

Fax modem hardware dependent on this specific driver will no longer work on Windows.

Microsoft recommends removing any existing dependencies on this hardware.

## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.8519 | [KB5066836](https://patchblox.com/security/data/fix/microsoft/kb5066836.md) | Oct 14, 2025 | | Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.7919 | [KB5066586](https://patchblox.com/security/data/fix/microsoft/kb5066586.md) | Oct 14, 2025 | | Microsoft | Windows 10 Version 21H2 for x64-based Systems | | [KB5066791](https://patchblox.com/security/data/fix/microsoft/kb5066791.md) | Oct 14, 2025 | | Microsoft | Windows 10 Version 22H2 for x64-based Systems | | [KB5066791](https://patchblox.com/security/data/fix/microsoft/kb5066791.md) | Oct 14, 2025 | | Microsoft | Windows 10 for x64-based Systems | 10240.21161 | [KB5066837](https://patchblox.com/security/data/fix/microsoft/kb5066837.md) | Oct 14, 2025 | | Microsoft | Windows 11 Version 22H2 for x64-based Systems | | [KB5066793](https://patchblox.com/security/data/fix/microsoft/kb5066793.md) | Oct 14, 2025 | | Microsoft | Windows 11 Version 23H2 for x64-based Systems | | [KB5066793](https://patchblox.com/security/data/fix/microsoft/kb5066793.md) | Oct 14, 2025 | | Microsoft | Windows 11 Version 24H2 for x64-based Systems | | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 | | Microsoft | Windows 11 Version 25H2 for x64-based Systems | | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB5066872](https://patchblox.com/security/data/fix/microsoft/kb5066872.md) | Oct 14, 2025 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB5066876](https://patchblox.com/security/data/fix/microsoft/kb5066876.md) | Oct 14, 2025 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB5066872](https://patchblox.com/security/data/fix/microsoft/kb5066872.md) | Oct 14, 2025 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB5066876](https://patchblox.com/security/data/fix/microsoft/kb5066876.md) | Oct 14, 2025 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB5066874](https://patchblox.com/security/data/fix/microsoft/kb5066874.md) | Oct 14, 2025 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB5066877](https://patchblox.com/security/data/fix/microsoft/kb5066877.md) | Oct 14, 2025 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | | [KB5066874](https://patchblox.com/security/data/fix/microsoft/kb5066874.md) | Oct 14, 2025 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | | [KB5066877](https://patchblox.com/security/data/fix/microsoft/kb5066877.md) | Oct 14, 2025 | | Microsoft | Windows Server 2012 | | [KB5066875](https://patchblox.com/security/data/fix/microsoft/kb5066875.md) | Oct 14, 2025 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB5066875](https://patchblox.com/security/data/fix/microsoft/kb5066875.md) | Oct 14, 2025 | | Microsoft | Windows Server 2012 R2 | | [KB5066873](https://patchblox.com/security/data/fix/microsoft/kb5066873.md) | Oct 14, 2025 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB5066873](https://patchblox.com/security/data/fix/microsoft/kb5066873.md) | Oct 14, 2025 | | Microsoft | Windows Server 2016 | 14393.8519 | [KB5066836](https://patchblox.com/security/data/fix/microsoft/kb5066836.md) | Oct 14, 2025 | | Microsoft | Windows Server 2016 (Server Core installation) | 14393.8519 | [KB5066836](https://patchblox.com/security/data/fix/microsoft/kb5066836.md) | Oct 14, 2025 | | Microsoft | Windows Server 2019 | 17763.7919 | [KB5066586](https://patchblox.com/security/data/fix/microsoft/kb5066586.md) | Oct 14, 2025 | | Microsoft | Windows Server 2019 (Server Core installation) | 17763.7919 | [KB5066586](https://patchblox.com/security/data/fix/microsoft/kb5066586.md) | Oct 14, 2025 | | Microsoft | Windows Server 2022 | 20348.4294 | [KB5066782](https://patchblox.com/security/data/fix/microsoft/kb5066782.md) | Oct 14, 2025 | | Microsoft | Windows Server 2022 (Server Core installation) | 20348.4294 | [KB5066782](https://patchblox.com/security/data/fix/microsoft/kb5066782.md) | Oct 14, 2025 | | Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 25398.1913 | [KB5066780](https://patchblox.com/security/data/fix/microsoft/kb5066780.md) | Oct 14, 2025 | | Microsoft | Windows Server 2025 | | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 | | Microsoft | Windows Server 2025 (Server Core installation) | | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 | --- Data as of 2026-11-08T19:12:23Z UTC. 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