PatchTheCVE: mailessentialshttps://patchthecve.com/CVEs with upgrade or downgrade fix stepsCVE-2025-34491: GFI MailEssentials prior to version 21.8 is vulnerable to a .NET deserialization issuehttps://patchthecve.com/cve/CVE-2025-34491.htmlhttps://patchthecve.com/cve/CVE-2025-34491.htmlWed, 17 Jun 2026 09:14:01 +0000HIGH 8.8: GFI MailEssentials prior to version 21.8 is vulnerable to a .NET deserialization issue. A remote and authenticated attacker can execute arbitrary code by sending crafted serialized .NET when joining to a Multi-Server setup.CVE-2025-34490: GFI MailEssentials prior to version 21.8 is vulnerable to an XML External Entity (XXE) issuehttps://patchthecve.com/cve/CVE-2025-34490.htmlhttps://patchthecve.com/cve/CVE-2025-34490.htmlWed, 17 Jun 2026 09:14:01 +0000MEDIUM 6.5: GFI MailEssentials prior to version 21.8 is vulnerable to an XML External Entity (XXE) issue. An authenticated and remote attacker can send crafted HTTP requests to read arbitrary system files.CVE-2025-34489: GFI MailEssentials prior to version 21.8 is vulnerable to a local privilege escalation issuehttps://patchthecve.com/cve/CVE-2025-34489.htmlhttps://patchthecve.com/cve/CVE-2025-34489.htmlWed, 17 Jun 2026 09:14:01 +0000HIGH 7.8: GFI MailEssentials prior to version 21.8 is vulnerable to a local privilege escalation issue. A local attacker can escalate to NT Authority/SYSTEM by sending a crafted serialized payload to a .NET Remoting Service.