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Distributed Denial of Service (DDoS) attacks remain one of the most effective cybercriminals methods to cause significant financial and operational damage. In Cloud Computing, these attacks’ goal is to shut down cloud servers, flooding them with traffic from compromised devices or networks. To address these issues, we offer SMC, a new approach to protect cloud servers against distributed denial of service attacks and mitigate their impact on network performance. SMC uses an SDN-based attack detection system to detect possible DDoS attacks and effectively mitigate their impact by rerouting malicious traffic, adjusting switch rule timeouts and aggregating these rules into SDN switch tables. Our experiments show that SMC maintains network performance during DDoS attacks. In addition, SMC significantly reduces packets’ loss and their average transmission time in the network during DDoS attacks.