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

> CVE-2019-9670: Synacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Reference. CVSS 9.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2019-9670
Last updated: 2025-10-21T23:45:36Z

- Published: 2019-05-29 21:04 UTC · Updated: 2025-10-21 23:45 UTC · Assigner: mitre
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 100.0%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2022-01-10, federal due date 2022-07-10, ransomware use: Unknown

## 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Synacor: Zimbra Collaboration Suite (ZCS)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2019-9670)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2019-9670)
- [http://packetstormsecurity.com/files/152487/Zimbra-Collaboration-Autodiscover-Servlet-XXE-ProxyServlet-SSRF.html](http://packetstormsecurity.com/files/152487/Zimbra-Collaboration-Autodiscover-Servlet-XXE-ProxyServlet-SSRF.html)
- [https://bugzilla.zimbra.com/show\_bug.cgi?id=109129](https://bugzilla.zimbra.com/show_bug.cgi?id=109129)
- [https://isc.sans.edu/forums/diary/CVE20199670+Zimbra+Collaboration+Suite+XXE+vulnerability/27570/](https://isc.sans.edu/forums/diary/CVE20199670+Zimbra+Collaboration+Suite+XXE+vulnerability/27570/)
- [https://wiki.zimbra.com/wiki/Zimbra\_Security\_Advisories](https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories)
- [https://www.exploit-db.com/exploits/46693/](https://www.exploit-db.com/exploits/46693/)
- [http://www.rapid7.com/db/modules/exploit/linux/http/zimbra\_xxe\_rce](http://www.rapid7.com/db/modules/exploit/linux/http/zimbra_xxe_rce)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2019-9670 · Markdown: https://rewindex.com/cve/CVE-2019-9670.md · JSON: https://rewindex.com/api/v1/cves/CVE-2019-9670 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:47:13.264Z