Zero-day vulnerability in Windows

Untrusted pointer dereference
CVE-2025-24990

Vulnerability details

Advisory: SB2025101458 - Privilege escalation in Microsoft Windows Agere Modem driver

Vulnerable component: Windows

CVE-ID: CVE-2025-24990

CVSSv3 score: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C

CWE-ID: CWE-822 - Untrusted Pointer Dereference

Description:

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to untrusted pointer dereference in the third party Agere Modem driver ltmdm64.sys that ships natively with supported Windows operating systems. A local user can pass specially crafted input to the driver and execute arbitrary code on the system with elevated privileges.

Note, the vulnerability is being actively exploited in the wild. 

External links:

https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2025-24990

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.