---
title: "CVE-2025-24983: Microsoft Windows Win32k Use-After-Free Vulnerability"
url: https://erroneo.us/security/cve/CVE-2025-24983/
description: "CVE-2025-24983 (Microsoft Windows): Exploited in the wild (CISA KEV). Use after free in Windows Win32 Kernel Subsystem allows an authorized attacker to…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-03-11
date_modified: 2026-02-26
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-24983"
kev: true
cvss: 7
epss: 0.01375
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-24983: Microsoft Windows Win32k Use-After-Free 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 2025-03-11, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-04-01 ; treat that as the outer limit, not the target.
- EPSS 1.4% , percentile 72: FIRST’s model estimates a 1.4% chance of exploitation activity in the next 30 days, higher than 72% of all scored CVEs (moderate). 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

Use after free in Windows Win32 Kernel Subsystem allows an authorized attacker to elevate privileges locally.

## Affected products (CVE record)

- Microsoft Windows 10 Version 1507: 10.0.10240.0 < 10.0.10240.20947
- Microsoft Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.7876
- Microsoft Windows Server 2008 R2 Service Pack 1: 6.1.7601.0 < 6.1.7601.27618
- Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation): 6.1.7601.0 < 6.1.7601.27618
- Microsoft Windows Server 2008 Service Pack 2: 6.0.6003.0 < 6.0.6003.23168
- Microsoft Windows Server 2008 Service Pack 2 (Server Core installation): 6.0.6003.0 < 6.0.6003.23168
- Microsoft Windows Server 2012: 6.2.9200.0 < 6.2.9200.25368
- Microsoft Windows Server 2012 (Server Core installation): 6.2.9200.0 < 6.2.9200.25368
- Microsoft Windows Server 2012 R2: 6.3.9600.0 < 6.3.9600.22470
- Microsoft Windows Server 2012 R2 (Server Core installation): 6.3.9600.0 < 6.3.9600.22470

## Severity

- microsoft CVSS 3.1: 7 `CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C`

## Exploitation

- CISA KEV: added 2025-03-11; federal due date 2025-04-01. 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): 1.38% probability of exploitation activity in the next 30 days; percentile 72.

## Sources

- [Windows Win32 Kernel Subsystem Elevation of Privilege Vulnerability](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-24983)
- [Listed in CISA KEV notes (msrc.microsoft.com)](https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-24983)
- [CVE.org record CVE-2025-24983](https://www.cve.org/CVERecord?id=CVE-2025-24983)
- [NVD entry CVE-2025-24983](https://nvd.nist.gov/vuln/detail/CVE-2025-24983)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-24983)

---
Source page: https://erroneo.us/security/cve/CVE-2025-24983/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt