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I. Basic Information for CVE-2026-33250
Vulnerability Information

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Vulnerability Title
Crash when receiving specially-crafted packets
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Freeciv21 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Freeciv21是longturn开源的一款回合制文明建设策略游戏。 Freeciv21 3.1.1之前版本存在安全漏洞,该漏洞源于处理特制数据包时存在栈溢出,可能导致远程攻击者使服务器崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
longturnfreeciv21 < 3.1.1 -
II. Public POCs for CVE-2026-33250
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III. Intelligence Information for CVE-2026-33250
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