HIGH • CVSS 3.1

CVE-2026-73570

CISA KNOWN EXPLOITED

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.

Prioritization

NVD CVSS: 8.9
Published: Aug 13, 2026 12:19 PM EDT
Modified: Aug 22, 2026 12:18 AM EDT
CISA KEV: Yes
KEV due date: 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.

Red Hat context

No Red Hat-specific cached context is available for this record.

DEFENSIVE REMEDIATION WORKFLOW

Recommended response

Treat as priority because it appears in CISA Known Exploited Vulnerabilities data; follow the required action and due date where applicable.
Identify affected assets with Qualys, Tanium, software inventory, CMDB or configuration-management data.
Confirm package/application applicability before change execution; CVSS alone does not prove that every host is vulnerable.
Patch, upgrade, rehydrate or apply a vendor-approved mitigation through controlled change. GraceITS can automate eligible waves with Ansible/Tanium.
Rescan after remediation and reconcile remaining exceptions, false positives, unsupported systems and compensating controls.

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