ZCS is an email server, calendaring, and chat and video platform, used by "thousands" of companies and "hundreds of millions" of individuals, according to the Zimbra website.
According to a report by Google's Threat Analysis Group (TAG) shared with Dark Reading, the zero-day exploitation started in June, before Zimbra offered remediation.
June 29: Unknown attackers target Greece. July 11: Winter Vivern APT campaign targets Moldova and Tunisia. July 20: Unknown attackers target Vietnam. Aug. 25: Unknown attackers target Pakistan.
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