CVE-2017-6821: Synacor Zimbra Collaboration Suite

Critical severity, CVSS 9.8. EPSS: 3.8% chance of exploitation in the next 30 days.

Directory traversal vulnerability in Zimbra Collaboration Suite (aka ZCS) before 8.7.6 allows attackers to have unspecified impact via unknown vectors.

Affected products

• Synacor Zimbra Collaboration Suite: up to and including 8.7.5

Published 2017-05-23. Last modified 2026-06-17.