CVE-2019-9670

CVE-2019-9670 is a critical-severity vulnerability in Synacor Zimbra Collaboration Suite with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-01-10). The underlying weakness is classified as CWE-611.

Key facts

• Severity: Critical (CVSS 3.x base score 9.8)
• CVSS v2: 7.5
• EPSS exploit prediction: 100% (100th percentile)
• Actively exploited: Yes — listed in CISA KEV (added 2022-01-10)
• EU (EUVD) id: EUVD-2019-19036
• EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-01-10)
• Weakness: CWE-611
• Affected product: Synacor Zimbra Collaboration Suite
• Published: 2019-05-29
• Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2019-9670?

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.

How severe is CVE-2019-9670?

CVE-2019-9670 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-9670 being actively exploited?

Yes. CVE-2019-9670 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-01-10, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2019-9670?

CVE-2019-9670 primarily affects Synacor Zimbra Collaboration Suite. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-9670?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2019-9670 have an EU (EUVD) identifier?

Yes. CVE-2019-9670 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-19036. It is also flagged as exploited in the EUVD (since 2022-01-10).

When was CVE-2019-9670 published?

CVE-2019-9670 was published on 2019-05-29 and last updated on 2026-06-17.

References

• http://packetstormsecurity.com/files/152487/Zimbra-Collaboration-Autodiscover-Servlet-XXE-ProxyServlet-SSRF.html
• http://www.rapid7.com/db/modules/exploit/linux/http/zimbra_xxe_rce
• https://bugzilla.zimbra.com/show_bug.cgi?id=109129
• https://isc.sans.edu/forums/diary/CVE20199670+Zimbra+Collaboration+Suite+XXE+vulnerability/27570/
• https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
• https://www.exploit-db.com/exploits/46693/
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-9670

Affected products (11)

• cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*
• cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:-:*:*:*:*:*:*
• cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:p1:*:*:*:*:*:*
• cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:p2:*:*:*:*:*:*
• cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:p3:*:*:*:*:*:*
• cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:p4:*:*:*:*:*:*
• cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:p5:*:*:*:*:*:*
• cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:p6:*:*:*:*:*:*
• cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:p7:*:*:*:*:*:*
• cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:p8:*:*:*:*:*:*
• cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:p9:*:*:*:*:*:*

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• CVE-2019-6980 — Critical (CVSS 9.8): Synacor Zimbra Collaboration Suite 8.7.x through 8.8.11 allows insecure object deserialization in the IMAP component.
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Other CWE-611 (Improper Restriction of XML External Entity Reference (XXE)) vulnerabilities

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• CVE-2019-14678 — Critical (CVSS 10.0): SAS XML Mapper 9.45 has an XML External Entity (XXE) vulnerability that can be leveraged by malicious attackers in…
• CVE-2015-9280 — Critical (CVSS 10.0): MailEnable before 8.60 allows XXE via an XML document in the request.aspx Options parameter.
• CVE-2018-1000838 — Critical (CVSS 10.0): autopsy version <= 4.9.0 contains a XML External Entity (XXE) vulnerability in CaseMetadata XML Parser that can result…
• CVE-2018-1000837 — Critical (CVSS 10.0): UML Designer version <= 8.0.0 contains a XML External Entity (XXE) vulnerability in XML parser for plugins that can…
• CVE-2018-1000835 — Critical (CVSS 10.0): KeePassDX version <= 2.5.0.0beta17 contains a XML External Entity (XXE) vulnerability in kdbx file parser that can…

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