Description
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).
Published: 2021-07-02
Score: 9.8 Critical
EPSS: 2.5% Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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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).
History

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

Type Values Removed Values Added
Metrics epss

{'score': 0.0245}

epss

{'score': 0.02663}


Subscriptions

Zimbra Collaboration
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

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

Reserved: 2021-06-22T00:00:00.000Z

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.

Weaknesses