Actively exploited in the wild
Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (SSRF) Vulnerability
Synacor - Zimbra Collaboration Suite (ZCS) · Listed in the CISA KEV since 2025-07-07. This indicates confirmed attacks in production environments.
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.
CVE-2019-9621
HighCVSS 7.5KEVSummary
An SSRF vulnerability in the ProxyServlet component of Zimbra Collaboration Suite. It allows an attacker to send requests from the server to internal resources.
Risk Assessment
An attacker could use the server as a proxy to attack internal systems, potentially leading to data exposure or further attacks.
Recommendation
Update Zimbra Collaboration Suite to a patched version (8.6 patch 13, 8.7.11 patch 10, 8.8.10 patch 7, or 8.8.11 patch 3).
Other vulnerabilities in Zimbra Collaboration Suite
See all- CVE-2022-37042CriticalActively exploited
Zimbra Collaboration Suite (ZCS) 8.8.15 and 9.0 has mboximport functionality that receives a ZIP archive and extracts files from it. By bypassing authentication (i.e., not having an authtoken), an attacker can upload arbitrary files to the system, leading to directory traversal and remote code execution. NOTE: this issue exists because of an incomplete fix for CVE-2022-27925.
- CVE-2022-27925HighActively exploited
Zimbra Collaboration (aka ZCS) 8.8.15 and 9.0 has mboximport functionality that receives a ZIP archive and extracts files from it. An authenticated user with administrator rights has the ability to upload arbitrary files to the system, leading to directory traversal.
- CVE-2022-24682MediumActively exploited
The Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 patch 30 allows an attacker to place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.
- CVE-2018-6882MediumActively exploited
A cross-site scripting (XSS) vulnerability in ZmMailMsgView.getAttachmentLinkHtml in Zimbra Collaboration Suite (ZCS) before 8.7 Patch 1 and 8.8.x before 8.8.7. Remote attackers can inject arbitrary web script or HTML via a Content-Location header in an email attachment.
Original NVD description (English source)
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.