---
id: "CVE-2025-30400"
kind: "vulnerability"
aliases: ["CVE-2025-30400"]
title: "Use after free in Windows DWM allows an authorized attacker to elevate privileges locally"
severity: "high"
cvss: 7.8
epss: null
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "Microsoft Windows", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows 10 1809", "fixed": ["10.0.17763.7314"], "affected": "< 10.0.17763.7314", "ecosystem": "vendor"}, {"name": "microsoft windows 10 21h2", "fixed": ["10.0.19044.5854"], "affected": "< 10.0.19044.5854", "ecosystem": "vendor"}, {"name": "microsoft windows 10 22h2", "fixed": ["10.0.19045.5854"], "affected": "< 10.0.19045.5854", "ecosystem": "vendor"}, {"name": "microsoft windows 11 22h2", "fixed": ["10.0.22621.5335"], "affected": "< 10.0.22621.5335", "ecosystem": "vendor"}, {"name": "microsoft windows 11 23h2", "fixed": ["10.0.22631.5335"], "affected": "< 10.0.22631.5335", "ecosystem": "vendor"}, {"name": "microsoft windows 11 24h2", "fixed": ["10.0.26100.3981"], "affected": "< 10.0.26100.3981", "ecosystem": "vendor"}, {"name": "microsoft windows server 2019", "fixed": ["10.0.17763.7314"], "affected": "< 10.0.17763.7314", "ecosystem": "vendor"}, {"name": "microsoft windows server 2022", "fixed": ["10.0.20348.3692"], "affected": "< 10.0.20348.3692", "ecosystem": "vendor"}, {"name": "microsoft windows server 2022 23h2", "fixed": ["10.0.25398.1611"], "affected": "< 10.0.25398.1611", "ecosystem": "vendor"}, {"name": "microsoft windows server 2025", "fixed": ["10.0.26100.3981"], "affected": "< 10.0.26100.3981", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "infrastructure", "multi-user-systems", "windows", "windows-servers"]
not_affected_if: ["fully-patched-windows", "non-windows"]
published_at: "2025-05-13T00:00:00+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T22:29:05+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-30400", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-30400", "first_seen_at": "2026-10-23T22:29:05+00:00"}]
---

# Use after free in Windows DWM allows an authorized attacker to elevate privileges locally

Microsoft Windows Desktop Window Manager (DWM) Core Library has a use-after-free bug that lets an authorized local user raise their privileges. Attackers exploit this in the wild, and CISA lists it in the Known Exploited Vulnerabilities catalog.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Microsoft Windows affected ? fixed ?
- vendor:microsoft windows 10 1809 affected < 10.0.17763.7314 fixed 10.0.17763.7314
- vendor:microsoft windows 10 21h2 affected < 10.0.19044.5854 fixed 10.0.19044.5854
- vendor:microsoft windows 10 22h2 affected < 10.0.19045.5854 fixed 10.0.19045.5854
- vendor:microsoft windows 11 22h2 affected < 10.0.22621.5335 fixed 10.0.22621.5335
- vendor:microsoft windows 11 23h2 affected < 10.0.22631.5335 fixed 10.0.22631.5335
- vendor:microsoft windows 11 24h2 affected < 10.0.26100.3981 fixed 10.0.26100.3981
- vendor:microsoft windows server 2019 affected < 10.0.17763.7314 fixed 10.0.17763.7314
- vendor:microsoft windows server 2022 affected < 10.0.20348.3692 fixed 10.0.20348.3692
- vendor:microsoft windows server 2022 23h2 affected < 10.0.25398.1611 fixed 10.0.25398.1611
- vendor:microsoft windows server 2025 affected < 10.0.26100.3981 fixed 10.0.26100.3981

## Fix

Apply the Microsoft security update for CVE-2025-30400 on affected Windows builds; check Microsoft's advisory for the exact KB. Follow the vendor mitigations per CISA's required action.

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-30400
- 2026-10-23T22:29:05+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2025-30400

## From the sources

Microsoft Windows DWM Core Library contains a use-after-free vulnerability that allows an authorized attacker to elevate privileges locally.

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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_