CISA Adds Actively Exploited Zimbra CVE-2026-73570 to KEV Catalog with Immediate Patching Deadline

CISA has added CVE-2026-73570 affecting Zimbra Collaboration Suite to its Known Exploited Vulnerabilities catalog, ordering urgent remediation due to confirmed active exploitation. The flaw enables unauthenticated remote command execution on servers where the optional zimbra-snmp package is installed and SNMP notifications are enabled. Exploitation occurs via specially crafted SMTP requests that trigger operating system command injection under the privileges of the zimbra user. Zimbra released the fix in version 10.1.20 on July 20, 2026, while CISA placed the vulnerability in the KEV list on August 21 and set an August 24 deadline for federal civilian agencies. Organizations are advised to first verify exposure by checking for zimbra-snmp and SNMP notification settings before applying the update. Post-patch steps include validating the version, controlled service restarts, and hunting for indicators such as unexpected Zimbra restarts, anomalous zimbra user activity, and new files in sensitive directories like /opt/zimbra/jetty/webapps/. The directive highlights the critical nature of pre-authentication flaws in internet-facing mail servers that process untrusted inbound traffic.

HispasecAugust 24, 2026Translated from Spanish

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CISA has added the vulnerability CVE-2026-73570 in Zimbra Collaboration Suite to its Known Exploited Vulnerabilities catalog and mandated immediate mitigation. The defect permits remote command execution without authentication on servers running the optional zimbra-snmp package with SNMP notifications enabled.

The Agency for Cybersecurity and Infrastructure Security of the United States has directed federal civilian agencies to apply the fix urgently. Although the directive targets U.S. federal entities, it effectively places maximum priority on any organization operating Zimbra servers exposed to the internet and processing inbound mail from untrusted networks.

The issue enables unauthenticated remote command execution. Exploitation requires the administrator to have installed the optional zimbra-snmp package and enabled SNMP notifications. In this configuration, an attacker can send manipulated SMTP requests that trigger operating-system-level command injection, executing arbitrary commands with the privileges of the zimbra user.

Zimbra corrected the flaw in Zimbra Collaboration Suite 10.1.20, released on July 20, 2026. CISA added the vulnerability to the KEV catalog on August 21, 2026, a step typically reserved for actively exploited issues. The agency set an August 24, 2026 mitigation deadline for the FCEB environment, underscoring the operational risk.

After patching, administrators should verify the version change, perform a controlled service restart, and confirm stability. If intrusion is suspected, further response includes searching for persistence mechanisms, reviewing authentication anomalies, analyzing unusual outbound connections, and rotating associated credentials.

CISA CVE-2026-73570 Zimbra Collaboration Suite zimbra-snmp ZCS 10.1.20

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