The Serious engine, as used in (1) Alpha Black Zero Intrepid Protocol 1.04 and earlier, (2) Nitro family, and (3) Serious Sam Second Encounter 1.07 allows remote attackers to cause a denial of service (server crash) via a large number of UDP join requests that exceeds the maximum player limit, as originally reported for Alpha Black Zero.
CVSS Severity (version 2.0):
Impact Subscore: 2.9
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows disruption of service
References to Advisories, Solutions, and Tools
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20041128 Players overflow in Serious engine UDP (was Alpha Black Zero, 29 Sep 2004)
20040929 Crash in Alpha Black Zero 1.04
Vulnerable software and versions