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).
This vulnerability carries a CRITICAL severity rating with a CVSS v3.1 score of 9.8, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 1 product from zimbra organizations running these solutions should prioritize assessment and patching.
Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.
2021-07-02T19:15:08.460
2024-11-21T06:12:03.717
Modified
CVSSv3.1: 9.8 (CRITICAL)
AV:N/AC:L/Au:N/C:P/I:P/A:P
10.0
6.4
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | zimbra | collaboration | < 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 8.8.15 | Yes |
| Application | zimbra | collaboration | 9.0.0 | Yes |
| Application | zimbra | collaboration | 9.0.0 | Yes |
| Application | zimbra | collaboration | 9.0.0 | Yes |
| Application | zimbra | collaboration | 9.0.0 | Yes |
| Application | zimbra | collaboration | 9.0.0 | Yes |
| Application | zimbra | collaboration | 9.0.0 | Yes |
| Application | zimbra | collaboration | 9.0.0 | Yes |
| Application | zimbra | collaboration | 9.0.0 | Yes |
| Application | zimbra | collaboration | 9.0.0 | Yes |
| Application | zimbra | collaboration | 9.0.0 | Yes |
| Application | zimbra | collaboration | 9.0.0 | Yes |
| Application | zimbra | collaboration | 9.0.0 | Yes |
| Application | zimbra | collaboration | 9.0.0 | Yes |
SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For zimbra's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.