Enlarge (credit: Steve McDowell / Agefotostock ) In late May, researchers drove out a team of China state hackers who over the previous seven months had exploited a critical vulnerability that gave them backdoors into the networks of a who’s who of sensitive organizations. Barracuda, the security vendor whose Email …

It’s not often that a zero-day vulnerability causes a network security vendor to urge customers to physically remove and decommission an entire line of affected hardware — as opposed to just applying software updates. But experts say that is exactly what transpired this week with Barracuda Networks, as the …