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CVE-2026-73570

Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability

Synacor Zimbra Collaboration Suite (ZCS) CWE-78

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.

CVSS Score
8.9
High
EPSS — Exploit Probability
12%
Riskier than 96% of all CVEs · checked 2026-10-03
Exploitation
Confirmed in the wild
KEV since 2026-08-21
Remediation
Patch available
Federal deadline 2026-08-24
CISA required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. Deadline for federal agencies: 2026-08-24.

NVD entry Vendor patch PoC / advisory CISA KEV

12 articles across 9 outlets · first covered Aug 20, 2026 · latest Oct 1, 2026

Coverage timeline

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