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CVE-2026-33250

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 mit
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:3789d62741dd81fdbbd2bf37e755f81196330798480cdf0447959703cd2a739b
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8f40e4cca643e4683ea6dc49a5fcbd419164416277bb9ed85b3ec3fe4fd7648d · sha256:844ecb6f886d3771… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-121","description":"CWE-121: Stack-based Buffer Overflow","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8f40e4cca643e4683ea6dc49a5fcbd419164416277bb9ed85b3ec3fe4fd7648d · sha256:844ecb6f886d3771… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"freeciv21","vendor":"longturn","versions":[{"status":"affected","version":"< 3.1.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8f40e4cca643e4683ea6dc49a5fcbd419164416277bb9ed85b3ec3fe4fd7648d · sha256:844ecb6f886d3771… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8f40e4cca643e4683ea6dc49a5fcbd419164416277bb9ed85b3ec3fe4fd7648d · sha256:844ecb6f886d3771… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8f40e4cca643e4683ea6dc49a5fcbd419164416277bb9ed85b3ec3fe4fd7648d · sha256:844ecb6f886d3771… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-121","description":"CWE-121: Stack-based Buffer Overflow","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8f40e4cca643e4683ea6dc49a5fcbd419164416277bb9ed85b3ec3fe4fd7648d · sha256:844ecb6f886d3771… · /containers/cna/problemTypes/1/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/longturn/freeciv21/commit/ad8e18ca22595529599782b2984bf44df8d69ed6","tags":["x_refsource_MISC"],"url":"https://github.com/longturn/freeciv21/commit/ad8e18ca22595529599782b2984bf44df8d69ed6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8f40e4cca643e4683ea6dc49a5fcbd419164416277bb9ed85b3ec3fe4fd7648d · sha256:844ecb6f886d3771… · /containers/cna/references/1
{"name":"https://github.com/longturn/freeciv21/releases/tag/v3.1.1","tags":["x_refsource_MISC"],"url":"https://github.com/longturn/freeciv21/releases/tag/v3.1.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8f40e4cca643e4683ea6dc49a5fcbd419164416277bb9ed85b3ec3fe4fd7648d · sha256:844ecb6f886d3771… · /containers/cna/references/2
{"name":"https://github.com/longturn/freeciv21/security/advisories/GHSA-f76g-6w3f-f6r3","tags":["x_refsource_CONFIRM"],"url":"https://github.com/longturn/freeciv21/security/advisories/GHSA-f76g-6w3f-f6r3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8f40e4cca643e4683ea6dc49a5fcbd419164416277bb9ed85b3ec3fe4fd7648d · sha256:844ecb6f886d3771… · /containers/cna/references/0
{"name":"https://redmine.freeciv.org/issues/1955","tags":["x_refsource_MISC"],"url":"https://redmine.freeciv.org/issues/1955"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8f40e4cca643e4683ea6dc49a5fcbd419164416277bb9ed85b3ec3fe4fd7648d · sha256:844ecb6f886d3771… · /containers/cna/references/3

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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