Is CVE-2019-9621 actively exploited?

Yes. CVE-2019-9621 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2019-9621 be exploited remotely?

The attack vector of CVE-2019-9621 has not been classified yet.

What is the CVSS score of CVE-2019-9621?

CVE-2019-9621 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2019-9621

HIGHCISA KEVIN THE WILD

CVE-2019-9621

Published: July 7, 2025

EPSS:94.11%probability of exploitation in 30 daysPercentile:99.9th

Official Description

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

NVD Source

CISA KEV Advisory

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

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

Added to KEV: 2025-07-07Federal patch deadline: 2025-07-28

Required Action (CISA)

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Risk Analysis

Synacor Zimbra Collaboration Suite (ZCS) is vulnerable to a server-side request forgery (SSRF) via the ProxyServlet component. With an EPSS score of 0.94113 and confirmed exploitation by CISA, this is a critical vulnerability with a high likelihood of active exploitation.

This vulnerability is actively being exploited in the wild. Attackers can leverage the SSRF flaw to make unauthorized requests from the server.

Recommended Action

Apply the latest security updates and patches for Synacor Zimbra Collaboration Suite (ZCS). Implement network segmentation and restrict outbound connections from the ZCS server.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2019-9621 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2019-9621 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.