---
title: "CVE-2025-24990: Microsoft Windows Untrusted Pointer Dereference Vulnerability"
url: https://erroneo.us/security/cve/CVE-2025-24990/
description: "CVE-2025-24990 (Microsoft Windows): Exploited in the wild (CISA KEV). Microsoft is aware of vulnerabilities in the third party Agere Modem driver that ships…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-10-14
date_modified: 2026-02-26
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-24990"
kev: true
cvss: 7.8
epss: 0.06369
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Microsoft Windows. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-10-14, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-11-04 ; treat that as the outer limit, not the target.
- EPSS 6.4% , percentile 94: FIRST’s model estimates a 6.4% chance of exploitation activity in the next 30 days, higher than 94% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Needs local access needed. Lower urgency for most teams unless an attacker could already run code on the machine.

## What it is

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 (CVE record)

- Microsoft Windows 10 Version 1507: 10.0.10240.0 < 10.0.10240.21161
- Microsoft Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.8519
- Microsoft Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.7919
- Microsoft Windows 10 Version 21H2: 10.0.19044.0 < 10.0.19044.6456
- Microsoft Windows 10 Version 22H2: 10.0.19045.0 < 10.0.19045.6456
- Microsoft Windows 11 version 22H2: 10.0.22621.0 < 10.0.22621.6060
- Microsoft Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.6060
- Microsoft Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.6899
- Microsoft Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.6899
- Microsoft Windows Server 2008 R2 Service Pack 1: 6.1.7601.0 < 6.1.7601.27974

## Severity

- microsoft CVSS 3.1: 7.8 `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C`

## Exploitation

- CISA KEV: added 2025-10-14; federal due date 2025-11-04. Known ransomware use: Unknown.
- 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.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 6.37% probability of exploitation activity in the next 30 days; percentile 94.

## Sources

- [Windows Agere Modem Driver Elevation of Privilege Vulnerability](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-24990)
- [Listed in CISA KEV notes (msrc.microsoft.com)](https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-24990)
- [CVE.org record CVE-2025-24990](https://www.cve.org/CVERecord?id=CVE-2025-24990)
- [NVD entry CVE-2025-24990](https://nvd.nist.gov/vuln/detail/CVE-2025-24990)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-24990)
- [vicarius.io](https://www.vicarius.io/vsociety/posts/cve-2025-24990-detection-script-elevation-of-privilege-vulnerability-in-agere-modem-driver-affecting-windows)
- [vicarius.io](https://www.vicarius.io/vsociety/posts/cve-2025-24990-mitigation-script-elevation-of-privilege-vulnerability-in-agere-modem-driver-affecting-windows)

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Source page: https://erroneo.us/security/cve/CVE-2025-24990/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt