CVE-2025-24990
Microsoft Windows Untrusted Pointer Dereference Vulnerability
Microsoft Windows
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.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 14 October 2025. US federal agencies were required to remediate it by 4 November 2025.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 6.4%, which is higher than 93.6% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Frequently asked questions
Is CVE-2025-24990 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2025-24990.
What does CVE-2025-24990 affect?
CVE-2025-24990 affects Microsoft Windows. 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.
How severe is CVE-2025-24990?
CVE-2025-24990 is rated HIGH with a CVSS base score of 7.8. EPSS puts the probability of exploitation in the next 30 days at 6.4%, higher than 93.6% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 4 November 2025.
How should organisations respond to CVE-2025-24990?
Apply the vendor patch for Microsoft Windows as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.