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

CVE-2021-43518 is fixed in 3 products on 1 platform, first by teeworlds 0.7.5-2, released December 15, 2021. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-43518
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0143
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 15, 2021

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | teeworlds Debian 12.15 (bookworm) | 0.7.5-2 | [DEBIAN-CVE-2021-43518](https://patchblox.com/security/data/fix/linux/debian-cve-2021-43518.md) | Dec 15, 2021 |
| Linux | teeworlds Debian 13.5 (trixie) | 0.7.5-2 | [DEBIAN-CVE-2021-43518](https://patchblox.com/security/data/fix/linux/debian-cve-2021-43518.md) | Dec 15, 2021 |
| Linux | teeworlds Debian 14 | 0.7.5-2 | [DEBIAN-CVE-2021-43518](https://patchblox.com/security/data/fix/linux/debian-cve-2021-43518.md) | Dec 15, 2021 |
| Linux | teeworlds Ubuntu 24.04.5 LTS (noble) | 0.7.5-2 | [teeworlds 0.7.5-2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-teeworlds-0.7.5-2.md) | Dec 15, 2021 |
| Linux | teeworlds Ubuntu 25.10 (questing) | 0.7.5-2 | [teeworlds 0.7.5-2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-teeworlds-0.7.5-2.md) | Dec 15, 2021 |
| Linux | teeworlds Ubuntu 26.04.1 LTS (resolute) | 0.7.5-2 | [teeworlds 0.7.5-2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-teeworlds-0.7.5-2.md) | Dec 15, 2021 |
| Linux | teeworlds-data Ubuntu 24.04.5 LTS (noble) | 0.7.5-2 | [teeworlds-data 0.7.5-2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-teeworlds-data-0.7.5-2.md) | Dec 15, 2021 |
| Linux | teeworlds-data Ubuntu 25.10 (questing) | 0.7.5-2 | [teeworlds-data 0.7.5-2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-teeworlds-data-0.7.5-2.md) | Dec 15, 2021 |
| Linux | teeworlds-data Ubuntu 26.04.1 LTS (resolute) | 0.7.5-2 | [teeworlds-data 0.7.5-2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-teeworlds-data-0.7.5-2.md) | Dec 15, 2021 |
| Linux | teeworlds-server Ubuntu 24.04.5 LTS (noble) | 0.7.5-2 | [teeworlds-server 0.7.5-2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-teeworlds-server-0.7.5-2.md) | Dec 15, 2021 |
| Linux | teeworlds-server Ubuntu 25.10 (questing) | 0.7.5-2 | [teeworlds-server 0.7.5-2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-teeworlds-server-0.7.5-2.md) | Dec 15, 2021 |
| Linux | teeworlds-server Ubuntu 26.04.1 LTS (resolute) | 0.7.5-2 | [teeworlds-server 0.7.5-2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-teeworlds-server-0.7.5-2.md) | Dec 15, 2021 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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