CVEs / CVE-2019-9621
CVE-2019-9621: Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (SSRF) Vulnerability
- Known exploited in the CISA KEV catalog since 7 Jul 2025
- high 7.5 CVSS 3.1 (NVD)
- EPSS 81% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
Synacor Zimbra Collaboration Suite (ZCS) contains a server-side request forgery (SSRF) vulnerability via the ProxyServlet component.
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 and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| n/a n/a | n/a | — |
Exploitation
| In CISA KEV since | 7 Jul 2025 |
|---|---|
| Due date for US federal agencies | 28 Jul 2025 |
| Used in ransomware campaigns | Unknown |
| Required action | Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. |
Severity
| CVSS 3.1 | 7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NScored by NVD |
|---|---|
| Weakness | CWE-918 |
References
- CVE-2019-9621 on NVD
- CVE-2019-9621 in the CISA KEV catalog
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories (cited by CISA)
- https://wiki.zimbra.com/wiki/Security_Center (cited by CISA)
- CVE-2019-9621 on OSV
- http://packetstormsecurity.com/files/152487/Zimbra-Collaboration-Autodiscover-Servlet-XXE-ProxyServlet-SSRF.html Exploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/153190/Zimbra-XML-Injection-Server-Side-Request-Forgery.html Exploit, Third Party Advisory, VDB Entry
- http://www.rapid7.com/db/modules/exploit/linux/http/zimbra_xxe_rce Exploit, Third Party Advisory
- https://blog.tint0.com/2019/03/a-saga-of-code-executions-on-zimbra.html Third Party Advisory
- https://blog.zimbra.com/2019/03/9826/ Vendor Advisory
- https://bugzilla.zimbra.com/show_bug.cgi?id=109127 Issue Tracking
- https://wiki.zimbra.com/wiki/Security_Center Release Notes, Vendor Advisory
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories Vendor 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-2019-9621 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.