CVE-2019-9621
Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (SSRF) Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 28 July 2025). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
Zimbra Collaboration Suite before 8.6 patch 13, 8.7.x before 8.7.11 patch 10, and 8.8.x before 8.8.10 patch 7 or 8.8.x before 8.8.11 patch 3 allows SSRF via the ProxyServlet component.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 81.04% probability · 100th percentile
- CISA KEV
- Listed 7 July 2025 · due 28 July 2025
- Weakness
- CWE-918
- Affected
- synacor/zimbra collaboration suite
- Source
- cve@mitre.org
CISA notes
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://wiki.zimbra.com/wiki/Security_Center ; https://nvd.nist.gov/vuln/detail/CVE-2019-9621
References
- http://packetstormsecurity.com/files/152487/Zimbra-Collaboration-Autodiscover-Servlet-XXE-ProxyServlet-SSRF.htmlExploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/153190/Zimbra-XML-Injection-Server-Side-Request-Forgery.htmlExploit, Third Party Advisory, VDB Entry
- http://www.rapid7.com/db/modules/exploit/linux/http/zimbra_xxe_rceExploit, Third Party Advisory
- https://blog.tint0.com/2019/03/a-saga-of-code-executions-on-zimbra.htmlThird Party Advisory
- https://blog.zimbra.com/2019/03/9826/Vendor Advisory
- https://bugzilla.zimbra.com/show_bug.cgi?id=109127Issue Tracking
- https://wiki.zimbra.com/wiki/Security_CenterRelease Notes, Vendor 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://packetstormsecurity.com/files/153190/Zimbra-XML-Injection-Server-Side-Request-Forgery.htmlExploit, Third Party Advisory, VDB Entry
- http://www.rapid7.com/db/modules/exploit/linux/http/zimbra_xxe_rceExploit, Third Party Advisory
- https://blog.tint0.com/2019/03/a-saga-of-code-executions-on-zimbra.htmlThird Party Advisory
- https://blog.zimbra.com/2019/03/9826/Vendor Advisory
- https://bugzilla.zimbra.com/show_bug.cgi?id=109127Issue Tracking
- https://wiki.zimbra.com/wiki/Security_CenterRelease Notes, Vendor 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-2019-9621US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.