Risk Letters

Exploited vulnerability

CVE-2019-9621

TLP:CLEAR

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.

Facts

  • Vendor: Synacor
  • Product: Zimbra Collaboration Suite (ZCS)
  • CVSS: 7.5
  • EPSS (probability of exploitation within 30 days): 81 %
  • On CISA's Known Exploited Vulnerabilities list since: 7 July 2025
  • First known exploitation: 7 July 2025
  • CISA's deadline for US federal agencies: 28 July 2025
  • Weakness: CWE-918
  • First seen by Risk Letters: 7 July 2025

Members see which Nordic sectors the flaw hits, and what to do about it.

Get the full brief

Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD