Disclosure summary
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.
Source-reported weakness categories
CWE-121
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
Microsoft Security Updates (CVRF) · 2025-Oct
Open original source · Updated Oct 14, 2025
Windows Agere Modem Driver Elevation of Privilege Vulnerability
Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.
Microsoft maximum product score: 7.8
| Vendor | Product / association | Version / bounds |
|---|---|---|
| Microsoft update guide | Windows 11 Version 25H2 for x64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows 10 Version 1809 for x64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2019 | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2019 (Server Core installation) | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2022 | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2022 (Server Core installation) | (MSRC status code 3) |
| Microsoft update guide | Windows 10 Version 21H2 for x64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows 11 Version 22H2 for x64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows 10 Version 22H2 for x64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2025 (Server Core installation) | (MSRC status code 3) |
| Microsoft update guide | Windows 11 Version 23H2 for x64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2022, 23H2 Edition (Server Core installation) | (MSRC status code 3) |
| Microsoft update guide | Windows 11 Version 24H2 for x64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2025 | (MSRC status code 3) |
| Microsoft update guide | Windows 10 for x64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows 10 Version 1607 for x64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2016 | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2016 (Server Core installation) | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2008 for x64-based Systems Service Pack 2 | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2012 | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2012 (Server Core installation) | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2012 R2 | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2012 R2 (Server Core installation) | (MSRC status code 3) |
Vendor remediation references
- 5066835 · build 10.0.26200.6899 · product IDs 20438
- Vendor guidance · product IDs 20438
- 5066835 · product IDs 20438, 12437, 12390, 12436
- 5066586 · build 10.0.17763.7919 · product IDs 11569, 11571, 11572
- Vendor guidance · product IDs 11569, 11571, 11572
- 5066782 · build 10.0.20348.4294 · product IDs 11923, 11924
- Vendor guidance · product IDs 11923, 11924
- 5066791 · build 10.0.19044.6456 · product IDs 11931
- Vendor guidance · product IDs 11931
- 5066791 · product IDs 11931, 12097
- 5066793 · build 10.0.22621.6060 · product IDs 12086
- Vendor guidance · product IDs 12086
- 5066791 · build 10.0.19045.6456 · product IDs 12097
- Vendor guidance · product IDs 12097
- 5066835 · build 10.0.26100.6899 · product IDs 12437, 12390, 12436
- Vendor guidance · product IDs 12437, 12390, 12436
- 5066793 · build 10.0.22631.6060 · product IDs 12243
- Vendor guidance · product IDs 12243
- 5066780 · build 10.0.25398.1913 · product IDs 12244
- Vendor guidance · product IDs 12244
- 5066837 · build 10.0.10240.21161 · product IDs 10735
- Vendor guidance · product IDs 10735
- 5066836 · build 10.0.14393.8519 · product IDs 10853, 10816, 10855
- Vendor guidance · product IDs 10853, 10816, 10855
- 5066874 · build 6.0.6003.23571 · product IDs 9318, 9344
- Vendor guidance · product IDs 9318, 9344
- 5066874 · product IDs 9318, 9344
- 5066877 · build 6.0.6003.23571 · product IDs 9318, 9344
- Vendor guidance · product IDs 9318, 9344
- 5066877 · product IDs 9318, 9344
- 5066872 · build 6.1.7601.27974 · product IDs 10051, 10049
- Vendor guidance · product IDs 10051, 10049
- 5066876 · build 6.1.7601.27974 · product IDs 10051, 10049
- Vendor guidance · product IDs 10051, 10049
- 5066875 · build 6.2.9200.25722 · product IDs 10378, 10379
- Vendor guidance · product IDs 10378, 10379
- 5066873 · build 6.3.9600.22824 · product IDs 10483, 10543
- Vendor guidance · product IDs 10483, 10543
Original records & references
- NIST NVD record
- CVE Program record
- msrc.microsoft.com — Vendor advisory
PUBLISHED 2025-10-14T03:00:00-04:00
MODIFIED 2025-10-14T03:00:00-04:00
INGESTED 2026-10-08T12:45:30-04:00