Integer underflow in Microsoft products - CVE-2025-21276
Published: January 14, 2025
Vulnerability identifier: #VU102649
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-21276
CWE-ID: CWE-191
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Microsoft Internet Explorer
Windows Server
Windows
Microsoft Internet Explorer
Windows Server
Windows
Detailed vulnerability description
The vulnerability allows a remote attacker to crash the browser.
The vulnerability exists due to integer underflow when handling HTML content in MapUrlToZone security feature. A remote attacker can trick the victim into opening a specially crafted HTML file, trigger an integer underflow and crash the browser.
How to mitigate CVE-2025-21276
Install updates from vendor's website.