Vulnerability Intelligence Report
CVE-2021-35209
An issue was discovered in ProxyServlet.java in the /proxy servlet in Zimbra Collaboration Suite 8.8 before 8.8.15 Patch 23 and 9.x before 9.0.0 Patch 16. The value of the X-Host header overwrites the value of the Host header in proxied requests. The value of X-Host header is not checked against the whitelist of hosts Zimbra is allowed to proxy to (the zimbraProxyAllowedDomains setting).
No Active Exploit Signals
CVSS Base Score
9.8
CRITICAL
EPSS Probability:2.97%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| zimbra | collaboration | 8.8.15, 9.0.0 |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
2.970%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | MITRE Corporation · N/A · USA |
| Reserved | 2021-06-22T00:00:00 |
| Published | 2021-07-02T18:54:43 |
| Last Updated | 2024-08-04T00:33:51 |
Community Chatter & Buzz