Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (SSRF) Vulnerability
n/a — n/a
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.
7.5
81.0%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Published
- Apr 30, 2019
- Modified
- Jun 17, 2026
- Added to KEV
- Jul 7, 2025
- Federal patch due
- Jul 28, 2025
CISA 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.
Weakness classification
Affected packages
Proof-of-concept & exploitation references
1 foundWeaponization
Public repositories whose name or description references CVE-2019-9621, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
References
How this class of flaw gets exploited
Frequently asked questions
What is CVE-2019-9621?
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.
How severe is CVE-2019-9621?
CVE-2019-9621 has a CVSS base score of 7.5 out of 10 (CVSS 3.1).
Is CVE-2019-9621 actively exploited in the wild?
Yes. CVE-2019-9621 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Jul 7, 2025, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2019-9621?
81.0% - meaning FIRST.org's EPSS model estimates a 81.0% probability this vulnerability will be exploited in the wild within 30 days (100% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2019-9621?
Yes - a public Nuclei template referencing CVE-2019-9621 exist in public repositories we checked. We also found 1 public GitHub repositories referencing this CVE.
What type of vulnerability is CVE-2019-9621?
CVE-2019-9621 is classified under CWE-918 (CWE-918 Server-Side Request Forgery (SSRF)).
Cross-checked against
Impactr finds and proves whether CVE-2019-9621 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.
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