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*Do you know what an OSI Application layer 7 is?


Suggested page: How does OSI Application layer 7 DDoS attack work?

A Layer 7 DDoS attack targets the application layer of the OSI model, the same layer that handles web requests. Unlike traditional DDoS attacks that flood networks, Layer 7 attacks focus on exhausting server resources, such as CPU, memory, or database capacity, by mimicking legitimate user behavior. These attacks use real HTTP/HTTPS requests with valid headers and session data, making them difficult to detect.

Common Layer 7 DDoS tactics include:

  • HTTP Floods: Massive volumes of GET or POST requests requiring full backend processing
  • Slowloris: Opens many connections and sends partial headers to keep them alive
  • Recursive Requests: Targets complex functions like search or filters that use heavy resources
  • SSL/TLS Handshake Abuse: Repeatedly initiates encrypted connections to drain CPU power
  • API Abuse: Targets exposed API endpoints to trigger backend workflows or integrations

By targeting high-resource functions such as login pages, attackers degrade performance or cause complete outages. Security tools that don't monitor behavior at the application layer may miss the threat entirely.

In case you are curious to discover more, we suggest you read everything you need to know about the Layer 7 DDoS attack!