CVE-2019-9621:CVE-2019-9621: SSRF vulnerability in Zimbra Collaboration Suite via the ProxyServlet component, affecting several releases prior to the patched versions.

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Description Preview

Zimbra Collaboration Suite versions prior to 8.6 patch 13, 8.7.x prior to 8.7.11 patch 10, and 8.8.x prior to 8.8.10 patch 7 or 8.8.x prior to 8.8.11 patch 3 are susceptible to a server-side request forgery (SSRF) through the ProxyServlet component. An attacker who can access the affected ProxyServlet could cause the Zimbra server to initiate requests to internal or external resources, potentially exposing sensitive data or enabling further compromise. The vulnerability, identified as CVE-2019-9621, was disclosed in March 2019, with patches provided in the specified fixed versions. Vendors published advisories and references detailing the impact and remediation steps.

Overview

This CVE describes an SSRF flaw in the Zimbra ProxyServlet that could allow an attacker to coax the Zimbra server into making arbitrary requests, potentially probing internal services or exfiltrating data. The issue affects legacy releases and is mitigated by applying the vendor-provided patches to reach the fixed versions (8.6 patch 13, 8.7.x up to 8.7.11 patch 10, or 8.8.x up to 8.8.10 patch 7, and 8.8.x up to 8.8.11 patch 3 or newer). Public references include Zimbra advisories, Bugzilla entries, and external writeups describing the vulnerability and related exploitation material.

Remediation

  • Upgrade to a patched release per the advisory: move to Zimbra 8.6 patch 13 or newer, 8.7.x to 8.7.11 patch 10 or newer, or 8.8.x to 8.8.10 patch 7 or newer (and 8.8.11 patch 3 or newer).
  • After upgrading, verify the install reflects the patched version and run compatibility and functionality tests in a staging environment before production redeployment.
  • Review Zimbra security advisories and apply any additional hardening recommendations provided by the vendor.
  • Run vulnerability scans and monitor logs for ProxyServlet access patterns to confirm the patch is effective and no SSRF activity is present.
  • If immediate patching is not feasible, apply compensating network controls to limit exposure to the ProxyServlet endpoint (e.g., restrict access to trusted networks) and plan a timely upgrade.

References

  • https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
  • https://wiki.zimbra.com/wiki/Security_Center
  • https://bugzilla.zimbra.com/show_bug.cgi?id=109127
  • http://www.rapid7.com/db/modules/exploit/linux/http/zimbra_xxe_rce
  • http://packetstormsecurity.com/files/152487/Zimbra-Collaboration-Autodiscover-Servlet-XXE-ProxyServlet-SSRF.html
  • https://www.exploit-db.com/exploits/46693/
  • https://blog.zimbra.com/2019/03/9826/
  • https://blog.tint0.com/2019/03/a-saga-of-code-executions-on-zimbra.html
  • http://packetstormsecurity.com/files/153190/Zimbra-XML-Injection-Server-Side-Request-Forgery.html

Early Warning

Customers using Armis Early Warning were notified about this vulnerability before it appeared in CISA's Known Exploited Vulnerabilities Catalog, enabling them to assess their exposure and act proactively. Armis offers these examples of CVEs already included in CISA KEV for potential customers. Click here to learn how to receive alerts earlier.

Armis Alert Date
Apr 30, 2019
CISA KEV Date
Jul 7, 2025
2260days early

Industry ExposureMost to least
This section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.

  1. Manufacturing: Low
    Manufacturing
  2. Retail Trade: Low
    Retail Trade
  3. Accommodation & Food Services: Low
    Accommodation & Food Services
  4. Administrative, Support, Waste Management & Remediation Services: Low
    Administrative, Support, Waste Management & Remediation Services
  5. Agriculture, Forestry Fishing & Hunting: Low
    Agriculture, Forestry Fishing & Hunting
  6. Arts, Entertainment & Recreation: Low
    Arts, Entertainment & Recreation
  7. Construction: Low
    Construction
  8. Educational Services: Low
    Educational Services
  9. Finance and Insurance: Low
    Finance and Insurance
  10. Health Care & Social Assistance: Low
    Health Care & Social Assistance
  11. Information: Low
    Information
  12. Management of Companies & Enterprises: Low
    Management of Companies & Enterprises
  13. Mining: Low
    Mining
  14. Other Services (except Public Administration): Low
    Other Services (except Public Administration)
  15. Professional, Scientific, & Technical Services: Low
    Professional, Scientific, & Technical Services
  16. Public Administration: Low
    Public Administration
  17. Real Estate Rental & Leasing: Low
    Real Estate Rental & Leasing
  18. Transportation & Warehousing: Low
    Transportation & Warehousing
  19. Utilities: Low
    Utilities
  20. Wholesale Trade: Low
    Wholesale Trade

Focus on What Matters

  1. See Everything.
  2. Identify True Risk.
  3. Proactively Mitigate Threats.

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