Nearly nine out of every 10 companies have devices that use outdated protocols, such as Microsoft’s Server Message Block version 1 for sharing files, giving attackers that breach the network perimeter an easy avenue to extend a compromise, according to a new report by network security firm ExtraHop. Microsoft’s SMBv1 protocol, developed in the 1980s and deprecated in 2013, continues to be detected in 88% of environments, with almost a third of organizations showing signs of at least 100 devices still using the protocol, the report states.

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