CVE-2016-4019 Synacor CVE debrief

Who should care

Zimbra Collaboration administrators, mail platform owners, and security teams responsible for internet-facing or broadly reachable collaboration services should prioritize this CVE, especially where older pre-8.7.0 builds remain in service.

Technical summary

NVD maps the affected product to synacor:zimbra_collaboration_suite and lists vulnerable versions through 8.6.0. The CVSS v3.0 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N, indicating a remotely reachable issue with no privileges required, no user interaction, and integrity impact only. The weakness classification is NVD-CWE-noinfo, so the exact flaw type is not publicly specified in the supplied record. The CVE references Zimbra release notes for 8.7.0 and the Zimbra security advisories page, which together indicate the vendor patch line for remediation.

Defensive priority

High. The combination of network reachability, no authentication requirement, and high integrity impact makes this important to address on any exposed or production Zimbra deployment before 8.7.0.

Recommended defensive actions

• Confirm whether any Zimbra Collaboration systems are running versions before 8.7.0.
• Upgrade affected systems to Zimbra Collaboration 8.7.0 or later, following vendor release and advisory guidance.
• Review the Zimbra Security Advisories page and related release notes before and after upgrading to ensure the correct remediation path.
• Prioritize internet-facing mail and collaboration systems first, then internal instances that handle sensitive data or administrative functions.
• After remediation, verify version compliance across all nodes and service components to avoid partial upgrades.

Evidence notes

The supplied NVD record states: vulnerable CPE versions through 8.6.0 for synacor:zimbra_collaboration_suite, CVSS 3.0 vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N, and CWE classification NVD-CWE-noinfo. The description says the issue affects Zimbra Collaboration before 8.7.0 and references bug 104477. Official references included in the record point to the Zimbra 8.7.0 release notes and Zimbra Security Advisories page, supporting the remediation boundary without adding unsupported technical detail.

Official resources