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CVE-2025-24990: Microsoft Windows Untrusted Pointer Dereference Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2025-10-14
• EPSS: 6.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-14 · updated 2026-06-17
• Weakness: CWE-822

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.

Affected products

• Microsoft Windows 10 Version 1507: before 10.0.10240.21161 — fixed in 10.0.10240.21161
• Microsoft Windows 10 1607: before 10.0.14393.8519 — fixed in 10.0.14393.8519
• Microsoft Windows 10: before 10.0.17763.7919 — fixed in 10.0.17763.7919
• Microsoft Windows 10: before 10.0.19044.6456 — fixed in 10.0.19044.6456
• Microsoft Windows 10: before 10.0.19045.6456 — fixed in 10.0.19045.6456
• Microsoft Windows 11: before 10.0.22621.6060 — fixed in 10.0.22621.6060
• Microsoft Windows 11: through 10.0.22631.6060
• Microsoft Windows 11: before 10.0.26100.6899 — fixed in 10.0.26100.6899
• Microsoft Windows 11 25H2: before 10.0.26200.6899 — fixed in 10.0.26200.6899
• Microsoft Windows Server 2008: r2-sp1
• Microsoft Windows Server 2012: r2
• Microsoft Windows Server 2016: through 10.0.14393.8519
• Microsoft Windows Server 2019: before 10.0.17763.7919 — fixed in 10.0.17763.7919
• Microsoft Windows Server 2022: before 10.0.20348.4294 — fixed in 10.0.20348.4294
• Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.1913 — fixed in 10.0.25398.1913
• Microsoft Windows Server 2025: through 10.0.26100.6899

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.21161; Microsoft Windows 10 1607 10.0.14393.8519; Microsoft Windows 10 10.0.17763.7919; Microsoft Windows 10 10.0.19044.6456; Microsoft Windows 10 10.0.19045.6456; Microsoft Windows 11 10.0.22621.6060; Microsoft Windows 11 10.0.26100.6899; Microsoft Windows 11 25H2 10.0.26200.6899; Microsoft Windows Server 2019 10.0.17763.7919; Microsoft Windows Server 2022 10.0.20348.4294; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1913. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-24990
• https://www.vicarius.io/vsociety/posts/cve-2025-24990-detection-script-elevation-of-privilege-vulnerability-in-agere-modem-driver-affecting-windows
• https://www.vicarius.io/vsociety/posts/cve-2025-24990-mitigation-script-elevation-of-privilege-vulnerability-in-agere-modem-driver-affecting-windows
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-24990

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