CVE-2011-10020

Kaillera 0.86 Server DoS via Malformed UDP Packet

Kaillera Server version 0.86 is vulnerable to a denial-of-service condition triggered by sending a malformed UDP packet after the initial handshake. Once a client sends a valid HELLO0.83 packet and receives a response, any subsequent malformed packet causes the server to crash and become unresponsive. This flaw stems from improper input validation in the server’s UDP packet handler, allowing unauthenticated remote attackers to disrupt service availability.

Affected

Kaillera Project · Server

CVSS v4.0 VULNCHECK

8.7 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS

1.31% chance of exploitation in the next 30 days, 70th percentile

Published

2025-08-20

Updated

2026-05-15

Proof-of-concept exploits (2)

• https://www.exploit-db.com/exploits/17460
• https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/auxiliary/do…

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/auxiliary/dos/windows/games/kaillera.rb

References

• CVE Record
• NVD entry