CVE-2026-33250
HIGHCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3Tags
Description
Freeciv21 is a free open source, turn-based, empire-building strategy game. Versions prior to 3.1.1 crash with a stack overflow when receiving specially-crafted packets. A remote attacker can use this to take down any public server. A malicious server can use this to crash the game on the player's machine. Authentication is not needed and, by default, logs do not contain any useful information. All users should upgrade to Freeciv21 version 3.1.1. Running the server behind a firewall can help mitigate the issue for non-public servers. For local games, Freeciv21 restricts connections to the current user and is therefore not affected.
Analysis
Freeciv21, an open-source turn-based strategy game, contains a stack overflow vulnerability that allows remote attackers to crash servers or client applications through specially-crafted network packets. All versions prior to 3.1.1 are affected, with exploitation requiring no authentication and leaving no useful logs by default. …
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Remediation
Within 24 hours: inventory all Freeciv21 deployments (game servers, client installations) and document version numbers; communicate risk to stakeholders. Within 7 days: disable public-facing Freeciv21 servers or restrict network access to trusted internal users only; update client advisory documentation. …
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Priority Score
Vendor Status
Debian
Bug #1131524| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| bullseye | fixed | (unfixed) | end-of-life |
| bookworm | fixed | 3.0.6-1+deb12u1 | - |
| bookworm (security) | fixed | 3.0.6-1+deb12u1 | - |
| trixie | fixed | 3.1.4+ds-2+deb13u1 | - |
| trixie (security) | fixed | 3.1.4+ds-2+deb13u1 | - |
| forky | vulnerable | 3.2.2+ds-1 | - |
| sid | fixed | 3.2.4+ds-1 | - |
| (unstable) | fixed | 3.2.4+ds-1 | - |
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External POC / Exploit Code
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