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
- Public exploits
- 2 in Exploit-DB · verified · first 12 April 2019
- CISA KEV
- Listed 7 July 2025 · due 28 July 2025
- Weakness
- CWE-918
- Affected
- synacor/zimbra collaboration suite
- Source
- cve@mitre.org
EPSS 81.0% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Public exploits (2)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
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, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.