Hackers can execute commands on a remote computer by sending malformed emails to a Zimbra mail server. It’s critical, but difficult to exploit. In an email sent Wednesday afternoon, Proofpoint researcher Greg Lesnewich seemed to largely concur that the attacks weren’t likely to lead to mass infections that could install ransomware or espionage malware. The researcher provided the following details: While the exploitation attempts we have observed were indiscriminate in targeting, we haven’t see…