CVE-2019-9670

Name: CVE-2019-9670
Creator: NVD / NIST
Published: 2019-05-29T22:29:01.507+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10Actively ExploitedEPSS 99.99%

Last modified Jun 17, 2026

CVE-2019-9670 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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 has confirmed active exploitation in the wild. EPSS estimates a 99.99% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

99.99%

100.0th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Jul 10, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Synacor	Zimbra Collaboration Suite	>= 8.7.0, < 8.7.11
Synacor	Zimbra Collaboration Suite	8.7.11

References

http://packetstormsecurity.com/files/152487/Zimbra-Collaboration-Autodiscover-Servlet-XXE-ProxyServlet-SSRF.htmlExploit, Third Party Advisory, VDB Entry
http://www.rapid7.com/db/modules/exploit/linux/http/zimbra_xxe_rceThird Party Advisory
https://bugzilla.zimbra.com/show_bug.cgi?id=109129Broken Link, Issue Tracking, Patch, Third Party Advisory
https://isc.sans.edu/forums/diary/CVE20199670+Zimbra+Collaboration+Suite+XXE+vulnerability/27570/Exploit, Third Party Advisory
https://wiki.zimbra.com/wiki/Zimbra_Security_AdvisoriesVendor Advisory
https://www.exploit-db.com/exploits/46693/Exploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/152487/Zimbra-Collaboration-Autodiscover-Servlet-XXE-ProxyServlet-SSRF.htmlExploit, Third Party Advisory, VDB Entry
http://www.rapid7.com/db/modules/exploit/linux/http/zimbra_xxe_rceThird Party Advisory
https://bugzilla.zimbra.com/show_bug.cgi?id=109129Broken Link, Issue Tracking, Patch, Third Party Advisory
https://isc.sans.edu/forums/diary/CVE20199670+Zimbra+Collaboration+Suite+XXE+vulnerability/27570/Exploit, Third Party Advisory
https://wiki.zimbra.com/wiki/Zimbra_Security_AdvisoriesVendor Advisory
https://www.exploit-db.com/exploits/46693/Exploit, Third Party Advisory, VDB Entry
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-9670US Government Resource

Timeline

Published: May 29, 2019
Last Modified: Jun 17, 2026
Status: Analyzed

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 score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 99.99% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2019-9670?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-9670?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST