CVE-2016-3414 Synacor CVE debrief

Who should care

Administrators and security teams running Zimbra Collaboration instances, especially deployments older than 8.6.0 Patch 7, should review this issue. It matters most where authenticated users have access and service availability is operationally critical.

Technical summary

The public record does not disclose the underlying flaw or attack path. The available evidence indicates network-reachable exploitation requiring low privileges and no user interaction, with the impact limited to availability (CVSS 3.0: AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). The vulnerable CPE range in NVD covers Synacor Zimbra Collaboration Suite versions up to and including 8.6.0, and the CVE text explicitly names Zimbra Collaboration before 8.6.0 Patch 7, also referred to as bug 102029.

Defensive priority

Medium. Patch promptly if you operate affected Zimbra Collaboration systems, but this issue is not listed as known-exploited in the supplied corpus and does not have a KEV entry.

Recommended defensive actions

• Upgrade or patch Zimbra Collaboration to 8.6.0 Patch 7 or later, using the vendor guidance linked from the Zimbra security advisory resources.
• Confirm which Zimbra systems are below 8.6.0 Patch 7 and prioritize those that expose authenticated access to many users.
• Review the vendor advisory and forum post for any product-specific remediation steps or rollout guidance before and after upgrading.
• Monitor service availability after applying the fix and validate that normal authenticated workflows still operate as expected.
• If immediate patching is not possible, reduce exposure by limiting authenticated access to trusted users and administrative paths where operationally feasible.

Evidence notes

Primary evidence comes from the CVE description and NVD metadata: the issue affects Zimbra Collaboration before 8.6.0 Patch 7, allows remote authenticated users to affect availability, and is associated with bug 102029. NVD lists the vulnerable CPE as cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:* with versionEndIncluding 8.6.0, and the CVSS vector is CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. References in the CVE record point to a SecurityFocus BID entry and Zimbra vendor advisory pages.

Official resources