CVE-2021-35209
Critical
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).
SeverityCritical
CVSS9.8
Exploit probability—
Product
Zimbra Collaboration
PublishedJul 2, 2021
First seenJul 2, 2021
How to fix
Update
- zimbra collaboration8.8.15 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| zimbra collaboration | 8.8 ≤ v < 8.8.15, 8.8.15, 9.0.0 | 8.8.15 |
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