CVE-2019-6980: Synacor Zimbra Collaboration Suite

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

Synacor Zimbra Collaboration Suite 8.7.x through 8.8.11 allows insecure object deserialization in the IMAP component.

Affected products

• Synacor Zimbra Collaboration Suite: from 8.7.0, before 8.7.11 (fixed in 8.7.11); from 8.8.0, before 8.8.9 (fixed in 8.8.9); version 8.7.11 only; version 8.8.9 only; version 8.8.10 only; version 8.8.11 only

Published 2019-05-29. Last modified 2026-06-17.