mailessentials vulnerabilities and fixes

Recent CVEs affecting mailessentials, with upgrade or downgrade steps. 3 tracked.

mailessentials has 3 tracked vulnerabilities, 0 critical. A fixed release or vendor patch exists for 3. Most recent: 2025-04-28. Highest priority: CVE-2025-34491 (score 51/100).

• CVE-2025-34491 HIGH 8.8 UPGRADE GFI MailEssentials prior to version 21.8 is vulnerable to a .NET deserialization issue
• CVE-2025-34490 MEDIUM 6.5 UPGRADE GFI MailEssentials prior to version 21.8 is vulnerable to an XML External Entity (XXE) issue
• CVE-2025-34489 HIGH 7.8 UPGRADE GFI MailEssentials prior to version 21.8 is vulnerable to a local privilege escalation issue

FAQ

How do I fix mailessentials vulnerabilities?

Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.

Is mailessentials being exploited right now?

None of the tracked mailessentials CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.

Which mailessentials CVE should I patch first?

CVE-2025-34491 currently ranks highest (51/100): GFI MailEssentials prior to version 21.8 is vulnerable to a .NET deserialization issue.

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