CVE-2019-9670mailboxd 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.
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It affects synacor zimbra_collaboration_suite. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Jan 10, 2022; federal agencies had to remediate by Jul 10, 2022. Treat that date as your deadline.
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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.
- CVSS
- 9.8 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-611
- Known exploited
- Added to CISA KEV Jan 10, 2022; federal remediation due Jul 10, 2022Apply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 99.99% (percentile 100)
- Assigned by
- mitre
- NVD analysis
- Analyzed
- Record last updated
- Oct 21, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
synacor zimbra_collaboration_suite synacor:zimbra_collaboration_suite | from 8.7.0 before 8.7.11; 8.7.11; 8.7.11; 8.7.11; 8.7.11; 8.7.11; 8.7.11; 8.7.11; and 3 more ranges | NVD |
References
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisoriesx-refsource-misc, vendor-advisory
- https://bugzilla.zimbra.com/show_bug.cgi?id=109129x-refsource-misc, broken-link, issue-tracking, patch, third-party-advisory
- http://www.rapid7.com/db/modules/exploit/linux/http/zimbra_xxe_rcex-refsource-misc, third-party-advisory
- http://packetstormsecurity.com/files/152487/Zimbra-Collaboration-Autodiscover-Servlet-XXE-ProxyServlet-SSRF.htmlx-refsource-misc, exploit, third-party-advisory, vdb-entry
- https://www.exploit-db.com/exploits/46693/exploit, x-refsource-exploit-db, third-party-advisory, vdb-entry
- https://isc.sans.edu/forums/diary/CVE20199670+Zimbra+Collaboration+Suite+XXE+vulnerability/27570/x-refsource-misc, exploit, third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-9670us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.