SSRF in Zimbra Collaboration Suite ProxyServlet
CVE-2019-9621 is a server-side request forgery vulnerability in the ProxyServlet component of Zimbra Collaboration Suite (ZCS). It affects ZCS 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 before 8.8.11 patch 3. The flaw allows a remote attacker to cause the Zimbra server to initiate arbitrary requests to internal or external resources through ProxyServlet. Public reporting and vendor references identify the issue specifically as SSRF in ProxyServlet; the provided content does not include lower-level implementation details beyond that component attribution.
Are you exposed to this one?
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository contains two main exploit implementations for CVE-2019-9621 and CVE-2019-9670, targeting Zimbra Collaboration Suite versions 8.5 to 8.7.11 (potentially up to <8.8.11). The exploits leverage an XXE vulnerability in the Autodiscover servlet to extract sensitive configuration (including LDAP credentials), then use those credentials to authenticate and escalate privileges via SSRF to the admin interface. Finally, a JSP webshell is uploaded to the server, granting remote code execution. The repository includes: - Zimbra_Rce.py: A standalone Python script that automates the full exploit chain, from XXE to webshell upload and access. - Zimbra_msf.rb: A Metasploit module implementing the same attack chain, allowing for customizable payloads and integration with the Metasploit framework. - zimbra.dtd: A DTD file used in the XXE attack to extract sensitive configuration files. - README.md: Brief documentation and references. The main attack vector is network-based, requiring access to the Zimbra web interface. The exploit is weaponized, with both standalone and framework-based implementations, and results in remote code execution on the target server. Multiple HTTP endpoints are targeted throughout the attack chain, and the exploit is highly effective against vulnerable Zimbra installations.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An SSRF vulnerability in Zimbra Collaboration Suite (ProxyServlet) affecting multiple pre-patch versions, enabling server-side request forgery.
A known Zimbra vulnerability exploited by Earth Lusca to gain access to public-facing servers.
A server-side request forgery (SSRF) vulnerability in Zimbra Collaboration Suite (ZCS) ProxyServlet that allows an unauthenticated remote attacker to induce the server to make arbitrary network requests, potentially exposing internal resources/data.
A server-side request forgery (SSRF) vulnerability in the Zimbra ProxyServlet component that allows attackers to make the Zimbra server initiate arbitrary requests to internal or external resources, potentially exposing sensitive data or enabling further compromise.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.