Actively exploited · Published Apr 30, 2019 · Assigned by mitre
CVE-2019-9621
High 7.5 Exploited
In plain English
A high-severity server-side request forgery in Zimbra Collaboration Suite (ZCS) from Synacor. Attackers are actively exploiting it in the wild (listed by CISA on July 7, 2025). The chance it is exploited in the next 30 days is estimated at 81.0% (higher than 99.6% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, Nuclei, public proof-of-concept code. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA guidance
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Federal agencies must remediate by Jul 28, 2025.
Official 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.
Affected products (as reported)
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories x_refsource_CONFIRM
- https://wiki.zimbra.com/wiki/Security_Center x_refsource_MISC
- https://bugzilla.zimbra.com/show_bug.cgi?id=109127 x_refsource_MISC
- http://www.rapid7.com/db/modules/exploit/linux/http/zimbra_xxe_rce x_refsource_MISC
- http://packetstormsecurity.com/files/152487/Zimbra-Collaboration-Autodiscover-Servlet-XXE-ProxyServlet-SSRF.html x_refsource_MISC
- 46693 exploit, x_refsource_EXPLOIT-DB
- https://blog.zimbra.com/2019/03/9826/ x_refsource_MISC
- https://blog.tint0.com/2019/03/a-saga-of-code-executions-on-zimbra.html x_refsource_MISC
- http://packetstormsecurity.com/files/153190/Zimbra-XML-Injection-Server-Side-Request-Forgery.html x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-9621 government-resource