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Memcached 1.5.5 contains a vulnerability in its UDP protocol support, where insufficient control over network message volume allows attackers to exploit the server as a UDP amplification vector. By sending small UDP packets to port 11211, an attacker can trigger the server to send much larger responses to a spoofed victim, resulting in a significant amplification factor (up to 1:50,000). This is due to the lack of proper validation and rate limiting in the UDP request handling logic.
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