Microsoft Exchange ProxyLogon attacks spike 10 times in four days Exploitations of the Microsoft Exchange ProxyLogon vulnerabilities have increased tenfold in just four days Share this item with your network: By Published: 15 Mar 2021 14:45 The number of attempted attacks observed against vulnerable Microsoft Exchange Servers has increased tenfold in the space of just four days, from 700 on Thursday 11 March to 7,200 a day by Monday 15 March, according to new data gathered from Check Point customers. According to Check Point Research, defenders are now in a race with malicious actors to thwart attacks against unpatched on-premise Microsoft Exchange Servers, with the US the country most affected, seeing 17% of all exploit attempts, followed by Germany, the UK, the Netherlands and Russia.