Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 21/08/2026. Patch affected systems as an emergency.
| Package | Affected versions | Patched versions |
|---|---|---|
| zimbra collaboration suite | < 10.1.20 | 10.1.20 |
A remote code execution vulnerability exists in Zimbra Collaboration (ZCS) before 10.1.20 when the optional zimbra-snmp package is installed and SNMP notifications are enabled. Due to improper sanitization of untrusted input during SNMP notification processing, an unauthenticated attacker can send specially crafted SMTP requests that may result in execution of arbitrary operating system commands as the Zimbra user.
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