# CVE-2019-9621: Zimbra - SSRF

> Live exploitation tracking for CVE-2019-9621 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2019-9621

## Key facts

- **Exploitation phase:** Limited Exploitation. The vulnerability is known but shows very limited attacker interest or exploitation activity.
- **CVSS score:** 7.5
- **Public exploit available:** Yes
- **Affected products:** Zimbra Collaboration Suite
- **Weaknesses:** CWE-918 (Server-Side Request Forgery (SSRF))
- **Tags:** mail

## Description

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.

## CrowdSec analysis

[CVE-2019-9621](https://euvd.enisa.europa.eu/vulnerability/CVE-2019-9621) is a server-side request forgery (SSRF) vulnerability in Zimbra Collaboration Suite versions prior to specific patches, which allows remote attackers to abuse the ProxyServlet component to make unauthorized requests to internal or external resources. This flaw could be exploited to access sensitive internal services or data, potentially leading to information disclosure or further attacks within the network.

CrowdSec has been tracking this vulnerability and its exploits since 15th of October 2025.

CrowdSec has not observed any significant exploitation activity targeting CVE-2019-9621 across its network. As a result, no community-driven trend analysis is available for this vulnerability at this time.

Attackers exploit this vulnerability by sending crafted XML payloads to the `/autodiscover` endpoint, leveraging XXE to trigger SSRF and access internal files or services.

## Timeline

- 2019-04-30: CVE Published. CVE-2019-9621 is published to NVD.
- 2025-07-07: CISA KEV. CVE-2019-9621 is added to the Known Exploited Vulnerabilities catalog by CISA.
- 2025-07-28: CISA Remediation Deadline. Expiration of the CISA remediation deadline as described in [BOD 22-01](https://www.cisa.gov/news-events/directives/bod-22-01-reducing-significant-risk-known-exploited-vulnerabilities).
- 2025-10-15: Rule Released. CrowdSec releases a rule to detect CVE-2019-9621 exploitation attempts against the CrowdSec Network.

## References

- http://www.rapid7.com/db/modules/exploit/linux/http/zimbra_xxe_rce
- https://wiki.zimbra.com/wiki/Security_Center
- http://packetstormsecurity.com/files/152487/Zimbra-Collaboration-Autodiscover-Servlet-XXE-ProxyServlet-SSRF.html
- https://blog.tint0.com/2019/03/a-saga-of-code-executions-on-zimbra.html
- https://bugzilla.zimbra.com/show_bug.cgi?id=109127
- https://blog.zimbra.com/2019/03/9826/
- http://packetstormsecurity.com/files/153190/Zimbra-XML-Injection-Server-Side-Request-Forgery.html
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2019/CVE-2019-9621.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2019-9621) follows observed exploitation activity for CVE-2019-9621. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.