What’s Vulnerable › Vulnerabilities

CVE-2011-1961

• Severity: critical (CVSS 9.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 34.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2011-08-10 · updated 2026-06-16

Description

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 11: 6, 7, 8, 9

References

• http://jvn.jp/en/jp/JVN80404511/index.html
• http://jvndb.jvn.jp/ja/contents/2011/JVNDB-2011-000060.html
• http://www.us-cert.gov/cas/techalerts/TA11-221A.html
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-057
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12684
• http://jvn.jp/en/jp/JVN80404511/index.html
• http://jvndb.jvn.jp/ja/contents/2011/JVNDB-2011-000060.html
• http://www.us-cert.gov/cas/techalerts/TA11-221A.html
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-057
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12684

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