CVE-2025-24990: Windows Agere Modem Driver Elevation of Privilege Vulnerability

Overview

Severity
High (CVSS 7.8)
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
Category
Elevation of Privilege
Exploit Status
Actively Exploited
Exploitation Likelihood
Detected
Patch Tuesday
2025-Oct
Released
2025-10-14
EPSS Score
3.90% (percentile: 88.3%)
CISA KEV
Listed — due 2025-11-04

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.

FAQ

What privileges could be gained by an attacker who successfully exploited the vulnerability? An attacker who successfully exploited this vulnerability could gain administrator privileges. Is the vulnerability only exploitable if the Agere Modem is actively being used? No. All supported versions of Windows can be affected by a successful exploitation of this vulnerability, even if the modem is not actively being used.

Known Exploits (1)

  • Microsoft Windows Untrusted Pointer Dereference Vulnerability — added 2025-10-16T04:44:08Z

Affected Products (26)

Windows

  • Windows 11 Version 25H2 for x64-based Systems
  • Windows 10 Version 1809 for x64-based Systems
  • Windows Server 2019
  • Windows Server 2019 (Server Core installation)
  • Windows Server 2022
  • Windows Server 2022 (Server Core installation)
  • Windows 10 Version 21H2 for x64-based Systems
  • Windows Server 2025 (Server Core installation)
  • Windows 11 Version 23H2 for x64-based Systems
  • Windows Server 2022, 23H2 Edition (Server Core installation)
  • Windows 11 Version 24H2 for x64-based Systems
  • Windows Server 2025
  • Windows 10 for x64-based Systems
  • Windows 10 Version 1607 for x64-based Systems
  • Windows Server 2016
  • Windows Server 2016 (Server Core installation)

ESU

  • Windows 11 Version 22H2 for x64-based Systems
  • Windows 10 Version 22H2 for x64-based Systems
  • Windows Server 2008 for x64-based Systems Service Pack 2
  • Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
  • Windows Server 2008 R2 for x64-based Systems Service Pack 1
  • Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
  • Windows Server 2012
  • Windows Server 2012 (Server Core installation)
  • Windows Server 2012 R2
  • Windows Server 2012 R2 (Server Core installation)

Security Updates (14)

Acknowledgments

<a href="https://x.com/shitsecure">Fabian Mosch</a> with <a href="https://www.r-tec.net/">r-tec IT Security GmbH</a> <a href="https://x.com/0xLegacyy">Jordan Jay </a> , Anonymous, MSTIC, MSTIC, <a href="https://x.com/shitsecure">Fabian Mosch</a> with <a href="https://www.r-tec.net/">r-tec IT Security GmbH</a> <a href="https://x.com/0xLegacyy">Jordan Jay </a>

Revision History

  • 2025-10-14: Information published.