# CVE-2021-30184: gnuchess: GNU Chess 6.2.7 allows attackers to execute arbitrary code via crafted PGN(Portable Game Notation) data

CVE-2021-30184 is fixed in gnuchess on 1 platform, first by gnuchess 6.2.7-1+deb11u1build0.22.04.1, released April 7, 2021. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-30184
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0177
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 7, 2021

## Description

GNU Chess 6.2.7 allows attackers to execute arbitrary code via crafted PGN(Portable Game Notation) data. This is related to a buffer overflow in theuse of a .tmp.epd temporary file in the cmd_pgnload and cmd_pgnreplayfunctions in frontend/cmd.cc.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | gnuchess Debian 11.6 (bullseye) | 6.2.7-1+deb11u1 | [DLA-4014-1](https://patchblox.com/security/data/fix/linux/dla-4014-1.md) | Jan 12, 2025 |
| Linux | gnuchess Ubuntu 22.04.1 LTS (jammy) | 6.2.7-1+deb11u1build0.22.04.1 | [gnuchess 6.2.7-1+deb11u1build0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-gnuchess-6.2.7-1-deb11u1build0.22.04.1.md) | Apr 7, 2021 |
| Linux | gnuchess Ubuntu 24.04.5 LTS (noble) | 6.2.7-1+deb11u1build0.24.04.1 | [gnuchess 6.2.7-1+deb11u1build0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-gnuchess-6.2.7-1-deb11u1build0.24.04.1.md) | Apr 7, 2021 |
| Linux | gnuchess Ubuntu 24.10 (oracular) | 6.2.7-1+deb11u1build0.24.10.1 | [gnuchess 6.2.7-1+deb11u1build0.24.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-gnuchess-6.2.7-1-deb11u1build0.24.10.1.md) | Jan 16, 2026 |

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