CVE-2019-9670Synacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Reference

mailboxd component in Synacor Zimbra Collaboration Suite 8.7.x before 8.7.11p10 has an XML External Entity injection (XXE) vulnerability, as demonstrated by Autodiscover/Autodiscover.xml.

9.8 CRITICALEPSS 99.98%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-06-17 02:44 UTC

OverviewCVSS details

9.8CRITICALCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: May 29, 2019
Assigner: mitre

Affected

zimbra collaboration suite (synacor)

Versions: 8.7.0 before 8.7.11 · 8.7.11
Fixed in: 8.7.11

All affected versions →

Exploitation

Public exploit: Yes · 3 references
CISA KEV: Listed · Jan 10, 2022
KEV due date: Jul 10, 2022
Ransomware use: Unknown
SSVC: Exploitation active · Automatable yes · Impact total

EPSS · FIRST, scored Nov 7

99.98%chance of exploitation in 30 days

Higher than 99.98% of CVEs

CVSS 3.1 · NVD

9.8Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

CVSS 2.0 · NVD

7.5High

AV:N/AC:L/Au:N/C:P/I:P/A:P

Attack vector: Network
Attack complexity: Low
Authentication: None
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
9.8	CRITICAL	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5	HIGH	2.0NVD	AV:N/AC:L/Au:N/C:P/I:P/A:P

CISA required action

⚡ Known exploited · remediation due Jul 10, 2022

Apply updates per vendor instructions.

Details

CVE ID: CVE-2019-9670
Status: Analyzed
Assigner (CNA): mitre
Published: May 29, 2019
Last modified: 2026-06-17 02:44 UTC
Weaknesses: CWE-611

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 11:29 UTC.