A system and method for out-of-path detection of cyber-attacks are provided. The method includes receiving, by a detector, a plurality of data feeds from a plurality of data sources, wherein the detector is communicatively connected to the plurality of data sources; processing, by the detector, the plurality of received data feeds to generate enriched Flow data sets; analyzing the enriched Flow data sets to detect a potential cyber-attack; and upon detection of a potential cyber-attack, providing indication to each network entity of the network entities that is under attack.