CVE Watch—

CVE-2019-9621

Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (SSRF) Vulnerability

CVSS

—

No CVSS

EPSS

81.0%

p100

KEV

YES

Jul 7, 2025

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

81.0%EPSS · 30 days81.0%

2026-09-172026-10-15

KEV catalog record

Product

Synacor / Zimbra Collaboration Suite (ZCS)

Vulnerability

Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (SSRF) Vulnerability

Added to KEV

Jul 7, 2025

Remediate by

Jul 28, 2025

Known ransomware use

Summary description

Synacor Zimbra Collaboration Suite (ZCS) contains a server-side request forgery (SSRF) vulnerability via the ProxyServlet component.

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.

Notes

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://wiki.zimbra.com/wiki/Security_Center ; https://nvd.nist.gov/vuln/detail/CVE-2019-9621

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