CVE-2025-21311 Windows NTLM V1 Elevation of Privilege Vulnerability
Critical 9.8
Published
Updated
Check this codebase for CVE-2025-21311 and fix it if it is affected.
What it is: CVE-2025-21311 is a critical vulnerability in Microsoft Windows 11 24h2, published on 14 Jan 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-21311 in the wild and no public exploit code.
Affected product: Microsoft Windows 11 24h2. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2025-21311/ (Markdown: https://insights.sbomify.com/CVE-2025-21311/index.md)
An attacker can exploit a flaw in Windows NTLM V1 to elevate privileges on affected Windows operating systems.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-21311?
CVE-2025-21311 is a critical vulnerability in Microsoft Windows 11 24h2, published on 14 Jan 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Windows NTLM V1 Elevation of Privilege Vulnerability
Weakness: CWE-303
Which versions are affected by CVE-2025-21311?
It affects 3 products.
Products include Microsoft Windows 11 24h2, Microsoft Windows Server 2022 23h2, Microsoft Windows Server 2025.
How do I fix CVE-2025-21311?
Apply the vendor's patch.
Is CVE-2025-21311 being exploited?
There is no known exploitation of CVE-2025-21311 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 11 24h2
- CVE-2025-60710 Microsoft Windows Link Following
- CVE-2026-54990 Remote Desktop Client Remote Code Execution Vulnerability
- CVE-2025-50165 Windows Graphics Component Remote Code Execution Vulnerability
- CVE-2026-108463 Windows SmartScreen Security Feature Bypass Vulnerability
- CVE-2026-83523 Windows Image Acquisition Remote Code Execution Vulnerability
Sources
Also known as DEBIAN-CVE-2025-21311, GHSA-29f7-2v24-7hpm, UBUNTU-CVE-2025-21311.