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7.5
Freeciv game crashes when receiving malicious internet traffic
CVE-2026-33250
Summary
Older versions of Freeciv game crash if sent fake data over the internet. This can let an attacker shut down public game servers, or crash the game on a player's computer. Upgrade to the latest version, 3.1.1, to fix this issue.
Original title
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 t...
Original 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.
nvd CVSS3.1
7.5
Vulnerability type
CWE-20
Improper Input Validation
CWE-121
Stack-based Buffer Overflow
Published: 24 Mar 2026 · Updated: 24 Mar 2026 · First seen: 24 Mar 2026