Cloud Security Heats up as Sourcefire Pays $21M for Immunet

Sourcefire, a publicly-traded network security company famous for its open source network intrusion detection system called Snort, has acquired cloud-based security startup Immunet for $21 million in cash. It's an impressive win for Immunet's CEO Oliver Friedrichs, a serial entrepreneur who helped found several old-world security companies like SecurityFocus, which was bought by Symantec in 2002, and Secure Networks, which was acquired by McAfee. Immunet only raised one round, a series A of about $2 million, led by Altos Ventures. Clearly, the company was onto something.

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