How severe is CVE-2016-3404?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Synacor Zimbra Collaboration Suite

CVE-2016-3404

Unspecified vulnerability in Zimbra Collaboration before 8.7.0 allows remote attackers to affect integrity via unknown vectors, aka bug 103959.

Published 2017-01-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.021 (81.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000

Affected products

Synacor Zimbra Collaboration Suite

References

wiki.zimbra.com/wiki/Zimbra_Releases/8.7.0 (Release Notes)
wiki.zimbra.com/wiki/Zimbra_Security_Advisories (Vendor Advisory)
www.securityfocus.com/bid/95894 (vdb-entry)

Frequently asked questions

What is CVE-2016-3404?: CVE-2016-3404 is a high-severity vulnerability in Synacor Zimbra Collaboration Suite. CVSS score: 7.5/10. Published 2017-01-18.
How severe is CVE-2016-3404?: High severity. CVSS v3 base score is 7.5 out of 10.