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

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 14 Oct 2025, the same day the CVE record was published.

How likely is exploitation in the next 30 days?

6.4%

EPSS score, percentile 93.6 of all scored records

How severe?

7.8 High

CVSS v3.1 base score, given by the CNA

What should I do?

Required action (CISA), due 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.

Advisories and patches (1)

Which versions are affected?

Affected: 10.0.10240.0 up to, not including, 10.0.10240.21161; 10.0.14393.0 up to, not including, 10.0.14393.8519; 10.0.17763.0 up to, not including, 10.0.17763.7919; 10.0.19044.0 up to, not including, 10.0.19044.6456; 10.0.19045.0 up to, not including, 10.0.19045.6456; 10.0.22621.0 up to, not including, 10.0.22621.6060; 10.0.22631.0 up to, not including, 10.0.22631.6060; 10.0.26100.0 up to, not including, 10.0.26100.6899; 10.0.26200.0 up to, not including, 10.0.26200.6899; 6.1.7601.0 up to, not including, 6.1.7601.27974; 6.1.7601.0 up to, not including, 6.1.7601.27974; 6.0.6003.0 up to, not including, 6.0.6003.23571; 6.0.6003.0 up to, not including, 6.0.6003.23571; 6.2.9200.0 up to, not including, 6.2.9200.25722; 6.2.9200.0 up to, not including, 6.2.9200.25722; 6.3.9600.0 up to, not including, 6.3.9600.22824; 6.3.9600.0 up to, not including, 6.3.9600.22824; 10.0.14393.0 up to, not including, 10.0.14393.8519; 10.0.14393.0 up to, not including, 10.0.14393.8519; 10.0.17763.0 up to, not including, 10.0.17763.7919

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

CISA due date for this action: 4 November 2025.

Advisories and patches

• Windows Agere Modem Driver Elevation of Privilege Vulnerability (Vendor advisory, Patch)

Linked from CISA's catalog entry

• https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-24990
• https://nvd.nist.gov/vuln/detail/CVE-2025-24990

Affected products and versions

As listed in the CVE record.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this vulnerability

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.

Summary: CISA's KEV catalog, as of 28 Oct 2026.

• CISA added CVE-2025-24990 to its Known Exploited Vulnerabilities (KEV) catalog on 14 Oct 2025.
• CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
• The due date CISA sets for the required action is 4 Nov 2025.
• The CVE record was published on 14 Oct 2025, the same day it was added to KEV.
• The CVE record carries a CVSS v3.1 base score of 7.8 (High), given by its CNA.
• FIRST's EPSS model puts the probability of exploitation in the next 30 days at 6.4% (percentile 93.6), as of 28 Oct 2026.
• CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

Description

Windows Agere Modem Driver Elevation of Privilege Vulnerability

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.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

• CWE-822: Untrusted Pointer Dereference

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

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