PT-2026-27072 · Freeciv21 · Freeciv21

Lmoureaux · Published 2026-01-01 · Updated 2026-03-24 · CVE-2026-33250

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Freeciv21 versions prior to 3.1.1

Description Freeciv21, a free and open-source turn-based strategy game, is susceptible to a crash caused by a stack overflow when processing specially crafted network packets. This issue allows a remote attacker to disrupt public servers, and a malicious server can crash the game on a player’s machine. The vulnerability does not require authentication. Logs, by default, do not provide helpful information for investigation.

Recommendations Upgrade to Freeciv21 version 3.1.1. For non-public servers, running the server behind a firewall can help mitigate the issue. For local games, Freeciv21 restricts connections to the current user and is therefore not affected.

Exploit

Fix

RCE

Stack Overflow

Weakness Enumeration

CWE-20

CWE-121

Related Identifiers

CVE-2026-33250

GHSA-F76G-6W3F-F6R3

OPENSUSE-SU-2026:10401-1

OPENSUSE-SU-2026:20423-1

Affected Products

Freeciv21

References · 18

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33250.json · Exploit
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-33250 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-33250 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33250 · Security Note
• https://ubuntu.com/security/CVE-2026-33250 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:20423-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-33250 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-33250 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-33250 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2026:10401-1 · Vendor Advisory
• https://github.com/longturn/freeciv21/releases/tag/v3.1.1 · Note
• https://github.com/longturn/freeciv21/commit/ad8e18ca22595529599782b2984bf44df8d69ed6 · Note
• https://github.com/longturn/freeciv21/security/advisories/GHSA-f76g-6w3f-f6r3 · Note
• https://suse.com/security/cve/CVE-2026-33250 · Note
• https://redmine.freeciv.org/issues/1955 · Note