A recently uncovered cyber-espionage campaign linked to Russian state-sponsored actors has been targeting enterprise webmail servers using a critical zero-day vulnerability in MDaemon, a widely used email server software. Dubbed “MailStorm” by researchers, the campaign exploits an unpatched buffer overflow flaw (CVE-2025-36721) in MDaemon’s Webmail client versions 23.0.0 to 23.5.2. Attackers deploy a multi-stage malware […]
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