CVEvulnerability
CVE-2021-35209
9.8 CRITICAL
Official page ↗
- Status
- Modified
- Published
- 2021-07-02
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CVSS 2.0 ([email protected])
- 7.5 HIGH — AV:N/AC:L/Au:N/C:P/I:P/A:P
- Weaknesses
- CWE-918
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).
Affected configurations
• zimbra collaboration (>= 8.8 < 8.8.15)
• zimbra collaboration 8.8.15
• zimbra collaboration 9.0.0
Related
Weakness · CWE (1)
- CWE-918 Server-Side Request Forgery weakness
References
- https://blog.sonarsource.com/zimbra-webmail-compromise-via-email Exploit, Third Party Advisory
- https://wiki.zimbra.com/wiki/Security_Center Release Notes, Vendor Advisory
- https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P23 Release Notes, Vendor Advisory
- https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P16 Release Notes, Vendor Advisory
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories Vendor Advisory
- https://blog.sonarsource.com/zimbra-webmail-compromise-via-email Exploit, Third Party Advisory
- https://wiki.zimbra.com/wiki/Security_Center Release Notes, Vendor Advisory
- https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P23 Release Notes, Vendor Advisory
- https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P16 Release Notes, Vendor Advisory
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories Vendor Advisory