CVE-2025-24990: Microsoft Windows Untrusted Pointer Dereference, actively exploited

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 breakdown

Attack vectorLocal

Attack complexityLow

Privileges requiredLow

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft Windows 10 1507< 10.0.10240.21161

Microsoft Windows 10 1607< 10.0.14393.8519

Microsoft Windows 10 1809< 10.0.17763.7919

Microsoft Windows 10 21h2< 10.0.19044.6456

Microsoft Windows 10 22h2< 10.0.19045.6456

Microsoft Windows 11 22h2< 10.0.22621.6060

Microsoft Windows 11 23h2≤ 10.0.22631.6060

Microsoft Windows 11 24h2< 10.0.26100.6899

Microsoft Windows 11 25h2< 10.0.26200.6899

Microsoft Windows Server 2008r2

Microsoft Windows Server 2012r2

Microsoft Windows Server 2016≤ 10.0.14393.8519

Microsoft Windows Server 2019< 10.0.17763.7919

Microsoft Windows Server 2022< 10.0.20348.4294

Microsoft Windows Server 2022 23h2< 10.0.25398.1913

Microsoft Windows Server 2025≤ 10.0.26100.6899

Remediation

Fixed in

Microsoft Windows 10 1507≥ 10.0.10240.21161

Microsoft Windows 10 1607≥ 10.0.14393.8519

Microsoft Windows 10 1809≥ 10.0.17763.7919

Microsoft Windows 10 21h2≥ 10.0.19044.6456

Microsoft Windows 10 22h2≥ 10.0.19045.6456

Microsoft Windows 11 22h2≥ 10.0.22621.6060

Microsoft Windows 11 24h2≥ 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

Patch & vendor advisories

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-24990

References

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

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2025-24990 being actively exploited?

Yes. CVE-2025-24990 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 14 Oct 2025.

How severe is CVE-2025-24990?

CVE-2025-24990 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 6.37% probability of exploitation.

Which products are affected by CVE-2025-24990?

Affected products include Microsoft Windows 10 1507, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, and 11 more.

How do I fix CVE-2025-24990?

Upgrade affected software to a fixed version, for example Microsoft Windows 10 1507 10.0.10240.21161, Microsoft Windows 10 1607 10.0.14393.8519, Microsoft Windows 10 1809 10.0.17763.7919 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-24990 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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