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).
Advisories
Source ID Title
EUVD EUVD EUVD-2021-21853 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).
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 16 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.0245}

epss

{'score': 0.02663}


cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2024-08-04T00:33:51.186Z

Reserved: 2021-06-22T00:00:00

Link: CVE-2021-35209

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2021-07-02T19:15:08.460

Modified: 2024-11-21T06:12:03.717

Link: CVE-2021-35209

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.