CVE-2011-1961: Microsoft Internet Explorer

High severity, CVSS 9.3. EPSS: 34.2% chance of exploitation in the next 30 days.

The telnet URI handler in Microsoft Internet Explorer 6 through 9 does not properly launch the handler application, which allows remote attackers to execute arbitrary programs via a crafted web site, aka "Telnet Handler Remote Code Execution Vulnerability."

Affected products

• Microsoft Internet Explorer: version 6 only; version 7 only; version 8 only; version 9 only

Published 2011-08-10. Last modified 2026-06-16.