CVE-2025-21191 Windows Local Security Authority (LSA) Elevation of Privilege Vulnerability
An authorized local attacker can exploit a race condition in Windows LSA to elevate privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-21191?
CVE-2025-21191 is a high-severity vulnerability in Microsoft Windows 10 1507, published on 8 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Time-of-check time-of-use (toctou) race condition in Windows Local Security Authority (LSA) allows an authorized attacker to elevate privileges locally.
Weakness: CWE-367
Which versions are affected by CVE-2025-21191?
It affects 15 products.
Products include Microsoft Windows 10 1507, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 22h2 and 9 more.
How do I fix CVE-2025-21191?
No fix has been published for CVE-2025-21191 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-21191 being exploited?
There is no known exploitation of CVE-2025-21191 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10 1507
- CVE-2017-8543 Microsoft Windows Search Remote Code Execution
- CVE-2025-33053 Microsoft Windows External Control of File Name or Path
- CVE-2025-33073 Microsoft Windows SMB Client Improper Access Control
- CVE-2024-49039 Microsoft Windows Task Scheduler Privilege Escalation
- CVE-2024-43461 Microsoft Windows MSHTML Platform Spoofing
Sources
Also known as GHSA-xwxw-9gfj-g2c9.