Get Permission From Thursday through Monday, Check Point Research tracked a tenfold increase in the number of attempts to exploit vulnerable on-premises Microsoft Exchange servers as many organizations are still racing to install patches. Global exploits of four vulnerabilities in Exchange servers grew from an estimated 700 on Thursday to about 7,200 on Monday as hackers continued to scramble to take advantage of the flaws before companies patched their systems, Check Point reports, citing results of its telemetry efforts. "Cybercriminals and other malicious actors know there is a finite time to act between the announcement of a vulnerability and the point where patches are released and in place," says Saryu Nayyar, CEO of the security firm Gurucul. "That time is rapidly closing for the Microsoft Exchange vulnerabilities."