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CISA KEV · Known exploitedHigh

CVE-2025-24990

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.

CVSS
7.8
EPSS
6.00%
92.6% percentile
CISA KEV
Listed
Published
2025.10.15
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability6.00%
Technical severityCVSS 7.8

Vulnerability overview

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 product and versions

Product
Microsoft Windows
Affected versions
10.0.10240.0, 10.0.14393.0, 10.0.17763.0, 10.0.19044.0, 10.0.19045.0, 10.0.22621.0, 10.0.22631.0, 10.0.26100.0, 10.0.26200.0, 6.1.7601.0, 6.0.6003.0, 6.2.9200.0, 6.3.9600.0, 10.0.20348.0, 10.0.25398.0, < 10.0.10240.21161, < 10.0.14393.8519, < 10.0.17763.7919, < 10.0.19044.6456, < 10.0.19045.6456
Fixed versions
10.0.10240.21161, 10.0.14393.8519, 10.0.17763.7919, 10.0.19044.6456, 10.0.19045.6456, 10.0.22621.6060, 10.0.26100.6899, 10.0.26200.6899, 10.0.20348.4294, 10.0.25398.1913

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Due date: 2025.11.04
  1. 1
    Identify

    Confirm that Microsoft Windows and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-822
KEV added
2025.10.14
Ransomware use
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