CVE-2018-6221: Trend Micro Email Encryption Gateway

High severity, CVSS 8.1. EPSS: 6.1% chance of exploitation in the next 30 days.

An unvalidated software update vulnerability in Trend Micro Email Encryption Gateway 5.5 could allow a man-in-the-middle attacker to tamper with an update file and inject their own.

Affected products

• Trend Micro Email Encryption Gateway: version 5.5 only

Published 2018-03-15. Last modified 2026-06-17.