How severe is CVE-2017-6813?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Synacor Zimbra Collaboration Suite

CVE-2017-6813

A service provided by Zimbra Collaboration Suite (ZCS) before 8.7.6 fails to require needed privileges before performing a few requested operations.

Published 2017-05-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.026 (84.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 84.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.026 · newest: 0.026 · change: 0.000

Affected products

Synacor Zimbra Collaboration Suite

References

wiki.zimbra.com/wiki/Security_Center (Vendor Advisory)
www.securityfocus.com/bid/98087 (VDB Entry, Third Party Advisory, vdb-entry)
wiki.zimbra.com/wiki/Zimbra_Releases/8.7.6 (Release Notes)

Frequently asked questions

What is CVE-2017-6813?: CVE-2017-6813 is a critical-severity vulnerability in Synacor Zimbra Collaboration Suite. CVSS score: 9.8/10. Published 2017-05-23.
How severe is CVE-2017-6813?: Critical severity. CVSS v3 base score is 9.8 out of 10.