CVE-2014-8563: Synacor Zimbra Collaboration Server

Critical severity, CVSS 9.8. EPSS: 2.5% chance of exploitation in the next 30 days.

Synacor Zimbra Collaboration before 8.0.9 allows plaintext command injection during STARTTLS.

Affected products

• Synacor Zimbra Collaboration Server: before 8.0.9 (fixed in 8.0.9)

Published 2020-01-27. Last modified 2026-06-17.