What is the CVSS score of CVE-2019-9670?

CVE-2019-9670 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 94.4%.

Which versions of Synacor Zimbra Collaboration Suite are affected by CVE-2019-9670?

Organizations using Synacor Zimbra Collaboration Suite 8.7.x face critical risk from CVE-2019-9670, a XML external entity vulnerability rated CVSS 9.8.. A patch is available.

Is there a public PoC exploit available for CVE-2019-9670?

Yes, a public proof-of-concept exploit is available for CVE-2019-9670. Prioritise patching immediately. EPSS: 94.4%.

How to fix or mitigate CVE-2019-9670?

Within 24 hours: Identify all affected systems running Synacor Zimbra Collaboration Suite 8.7.x and apply vendor patches immediately. Vendor patch is available.

Synacor Zimbra Collaboration Suite CVE-2019-9670

CRITICAL

Improper Restriction of XML External Entity Reference (CWE-611)

2019-05-29 cve@mitre.org

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 26, 2026 - 11:19 vuln.today

Added to CISA KEV

Nov 04, 2025 - 16:46 cisa

CISA KEV

PoC Detected

Nov 04, 2025 - 16:46 vuln.today

Public exploit code

Patch released

Nov 04, 2025 - 16:46 nvd

Patch available

CVE Published

May 29, 2019 - 22:29 nvd

CRITICAL 9.8

DescriptionCVE.org

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.

AnalysisAI

Synacor Zimbra Collaboration Suite 8.7.x contains an XML External Entity (XXE) injection vulnerability in the Autodiscover endpoint that allows unauthenticated attackers to read files and achieve server-side request forgery.

Technical ContextAI

The CWE-611 XXE injection in Zimbra's Autodiscover/Autodiscover.xml endpoint accepts XML input without disabling external entity processing. Attackers inject XXE payloads to read local files (including Zimbra's localconfig.xml containing database credentials) and perform SSRF to access internal services.

Affected ProductsAI

Synacor Zimbra Collaboration Suite 8.7.x before 8.7.11p10

RemediationAI

Update Zimbra to 8.7.11p10+. Disable external XML entity processing. Rotate all database credentials. Audit for unauthorized admin accounts and email access.

CVE-2019-9670 vulnerability details – vuln.today

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Synacor Zimbra Collaboration Suite CVE-2019-9670

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

Affected ProductsAI

RemediationAI

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External POC / Exploit Code