CVE-2021-28042: Deutschepost Mailoptimizer

High severity, CVSS 7.8. EPSS: 3.4% chance of exploitation in the next 30 days.

Deutsche Post Mailoptimizer 4.3 before 2020-11-09 allows Directory Traversal via a crafted ZIP archive to the Upload feature or the MO Connect component. This can lead to remote code execution.

Affected products

• Deutschepost Mailoptimizer: version 4.3 only

Published 2021-03-05. Last modified 2026-06-17.