CVE-2025-21343 Windows Web Threat Defense User Service Information Disclosure Vulnerability
An attacker can exploit the Windows Web Threat Defense User Service to disclose sensitive information, requiring a security patch.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-21343?
CVE-2025-21343 is a high-severity vulnerability in Microsoft Windows 11 22h2, 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 Web Threat Defense User Service Information Disclosure Vulnerability
Weakness: CWE-269
Which versions are affected by CVE-2025-21343?
It affects 3 products.
Products include Microsoft Windows 11 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2.
How do I fix CVE-2025-21343?
No fix has been published for CVE-2025-21343 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-21343 being exploited?
There is no known exploitation of CVE-2025-21343 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 11 22h2
- CVE-2024-49117 Windows Hyper-V Remote Code Execution Vulnerability
- CVE-2024-21435 Windows OLE Remote Code Execution Vulnerability
- CVE-2025-24084 Windows Subsystem for Linux (WSL2) Kernel Remote Code Execution Vulnerability
- CVE-2025-33054 Remote Desktop Spoofing Vulnerability
- CVE-2025-29828 Windows Schannel Remote Code Execution Vulnerability
Sources
Also known as GHSA-rrm6-257m-2hgw.