CVE-2025-24990
Windows Agere Modem Driver Elevation of Privilege Vulnerability
In short
A vulnerability in the Agere Modem driver that comes with Windows allows attackers to gain elevated system privileges. Microsoft has removed this driver and users should stop relying on fax modem hardware that depends on it.
Technical detail
The Agere Modem driver (ltmdm64.sys) contains a privilege escalation vulnerability (CWE-822) that enables local attackers to elevate privileges to system level. The driver has been removed in October cumulative updates; systems still using dependent fax modem hardware are exposed until updated.
Summary generated and translated by AI from the official 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.
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
Affected products
Microsoft · Windows 10 Version 1507Microsoft · Windows 10 Version 1607Microsoft · Windows 10 Version 1809Microsoft · Windows 10 Version 21H2Microsoft · Windows 10 Version 22H2Microsoft · Windows 11 version 22H2Microsoft · Windows 11 Version 23H2Microsoft · Windows 11 Version 24H2Microsoft · Windows 11 Version 25H2Microsoft · Windows Server 2008 R2 Service Pack 1Microsoft · Windows Server 2008 R2 Service Pack 1 (Server Core installation)Microsoft · Windows Server 2008 Service Pack 2Microsoft · Windows Server 2008 Service Pack 2 (Server Core installation)Microsoft · Windows Server 2012Microsoft · Windows Server 2012 R2Microsoft · Windows Server 2012 R2 (Server Core installation)Microsoft · Windows Server 2012 (Server Core installation)Microsoft · Windows Server 2016Microsoft · Windows Server 2016 (Server Core installation)Microsoft · Windows Server 2019Microsoft · Windows Server 2019 (Server Core installation)Microsoft · Windows Server 2022Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)Microsoft · Windows Server 2025Microsoft · Windows Server 2025 (Server Core installation)Want to know if your infrastructure is exposed to this?
Talk to TrueHacking →References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-24990https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-24990https://www.vicarius.io/vsociety/posts/cve-2025-24990-detection-script-elevation-of-privilege-vulnerability-in-agere-modem-driver-affecting-windowshttps://www.vicarius.io/vsociety/posts/cve-2025-24990-mitigation-script-elevation-of-privilege-vulnerability-in-agere-modem-driver-affecting-windows