- The Aisuru botnet launched an unprecedented 31.4 Tbps DDoS attack in the telecommunications sector
- Cloudflare mitigated “The Night Before Christmas” campaign without major disruptions
- Botnet uses compromised consumer devices with weak credentials or outdated firmware
In late December 2025, an unnamed company in the telecommunications industry was subject to the largest distributed denial of service (DDoS) attack ever seen.
Cloudflare recently released its Q4 2025 DDoS Threat Report, in which it said it successfully mitigated an attack from the Aisuru botnet. For those unfamiliar with Aisuru, it is currently one of the largest botnets in existence, boasting hundreds of thousands of devices and is regularly blamed for the largest DDoS attacks.
On December 19, Aisuru targeted several companies, primarily in the telecommunications industry, with a distributed denial-of-service attack that, at one point, peaked at 31.4 Tbps and 200 million requests per second. This made it the largest DDoS attack ever recorded, breaking the previous record, also held by Aisuru, which reached 29.7 Tbps.
Unprecedented bombing
Cloudflare described it as an “unprecedented blitz” on the telecom and IT industry, calling the campaign “The Night Before Christmas”:
“The campaign targeted Cloudflare customers as well as Cloudflare's dashboard and infrastructure with hypervolumetric HTTP DDoS attacks exceeding rates of 200 million requests per second (rps) along with Layer 4 DDoS attacks peaking at 31.4 terabits per second, making it the largest attack ever publicly disclosed,” Cloudflare explained.
Most Aisuru attacks typically last between one and two minutes and max out at between 1 and 5 Tbps. The majority (94%) ranged between 1 billion and 5 billion packets per second.
Aisuru is currently one of the largest and most dangerous botnets in existence, with hundreds of thousands of home routers, smart cameras, DVR systems, and other consumer equipment. Attackers often target outdated firmware or weak credentials to gain access to devices and install malware that allows them to send traffic wherever and whenever they want.
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