Blog.Cloudflare DigiCert Reports Record DDoS Attacks on UltraDNS in December 2025
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DigiCert experienced a significant increase in distributed denial-of-service (DDoS) attacks targeting its UltraDNS service, with incidents escalating from 18 in November to 176 in December 2025. Overall DDoS attacks surged from 1,067 in November to 2,200 in December, marking a 106% month-on-month increase. This spike indicates a notable shift in attack patterns during the final quarter of 2025.
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