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Vulnerability record · CVE-2003-1433 · published 31 December 2003

CVE-2003-1433: Epic games unreal engine improper authentication vulnerability

Epic Games · Unreal Engine

Epic Games Unreal Engine 226f through 436 does not validate the challenge key, which allows remote attackers to exhaust the player limit by joining the game multiple times.

4.3 CVSS 2.0 Medium EPSS 1.2% · top 33.6% CWE-287 · Improper authentication
4.3CVSS 2.0 base score
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
16 Jun 2026Last modified by NVD

Description

Epic Games Unreal Engine 226f through 436 does not validate the challenge key, which allows remote attackers to exhaust the player limit by joining the game multiple times.

AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://archives.neohapsis.com/archives/bugtraq/2003-02/0063.html
http://archives.neohapsis.com/archives/bugtraq/2003-02/0142.html
http://www.pivx.com/luigi/adv/ueng-adv.txt
http://www.securityfocus.com/bid/6771
https://exchange.xforce.ibmcloud.com/vulnerabilities/11304
http://archives.neohapsis.com/archives/bugtraq/2003-02/0063.html
http://archives.neohapsis.com/archives/bugtraq/2003-02/0142.html
http://www.pivx.com/luigi/adv/ueng-adv.txt
http://www.securityfocus.com/bid/6771
https://exchange.xforce.ibmcloud.com/vulnerabilities/11304

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2004-0608Unreal Engine UDP secure query buffer overflow allows remote code executionThe Unreal Engine, as used in numerous games including DeusEx, Unreal Tournament, Unreal Tournament 2003/2004, Postal 2, Rune, and others, mishandles…EPSS 74%analysed10.0CVE-2003-1432Epic games unreal engine code injection vulnerabilityEpic Games Unreal Engine 226f through 436 allows remote attackers to cause a denial of service (CPU consumption or crash) and possibly execute arbitr…EPSS 7.5%7.1CVE-2003-1431Epic games unreal engine memory buffer overflow vulnerabilityBuffer overflow in Epic Games Unreal Engine 226f through 436 allows remote attackers to cause a denial of service (crash) via a long host string in t…EPSS 5.2%5.0CVE-2007-4442Epic games unreal engine vulnerabilityStack-based buffer overflow in the logging function in the Unreal engine, possibly 2003 and 2004, as used in the internal web server, allows remote a…EPSS 3.8%5.0CVE-2007-4443Epic games unreal engine vulnerabilityThe UCC dedicated server for the Unreal engine, possibly 2003 and 2004, on Windows allows remote attackers to cause a denial of service (continuous b…EPSS 1.7%5.0CVE-2004-1805Epic games unreal engine vulnerabilityFormat string vulnerability in games using the Epic Games Unreal Engine 436 allows remote attackers to cause a denial of service (crash) and possibly…EPSS 6.4%5.0CVE-2004-1958Epic games unreal engine vulnerabilityDirectory traversal vulnerability in manifest.ini in Unreal engine allows remote attackers to overwrite arbitrary files via .. (dot dot) sequences in…EPSS 2.4%5.0CVE-2003-1430Epic games unreal engine path traversal vulnerabilityDirectory traversal vulnerability in Unreal Tournament Server 436 and earlier allows remote attackers to access known files via a ".." (dot dot) in a…EPSS 2.8%

Source: NIST National Vulnerability Database (record CVE-2003-1433), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.