Microsoft Windows Untrusted Pointer Dereference Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2025-10-14

[ Description ]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.

CISA: Microsoft Windows Agere Modem Driver contains an untrusted pointer dereference vulnerability that allows for privilege escalation. An attacker who successfully exploited this vulnerability could gain administrator privileges.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 4 Nov 2025): Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• msrc.microsoft.com/update-guide/vulnerability/CVE-2025-24990Vendor Advisory
• www.vicarius.io/vsociety/posts/cve-2025-24990-detection-script-elevation-of-privilege-v…Third Party Advisory
• www.vicarius.io/vsociety/posts/cve-2025-24990-mitigation-script-elevation-of-privilege-…MitigationThird Party Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource