CVE-2026-73570

CVE Enrichment

CVSS: 8.9 HIGH
EPSS: 71.66%
EPSS Percentile: 99.41%
CISA KEV: YES — Known Exploited Vulnerability

Description

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.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: cve@mitre.org
Published: 13-Aug-2026 23:19
Last Modified: 24-Aug-2026 20:19
EPSS Date: 2026-10-10
CWE: CWE-78

CVSS Vector


            CVSS:3.1                            AV:N /
                            AC:H /
                            PR:N /
                            UI:N /
                            S:C /
                            C:H /
                            I:H /
                            A:L

CISA KEV Details

Date Added: 2026-08-21
Remediation Due: 2026-08-24
Known Ransomware Campaign Use: Unknown
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.
Notes: https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://blog.zimbra.com/2026/07/patch-release-update-zimbra-10-1-20/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-73570

Affected Products / Versions

synacor / zimbra_collaboration_suite
Version / affected range: * · before (exclusive) 10.1.20
cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*

References

Last enrichment sync: 11-Oct-2026 10:51
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (3)

Microsoft Threat Intelligence identified and tracked exploitation of CVE-2026-73570, an unauthenticated OS command injection vulnerability in the Zimbra Collaboration Suite SNMP notification path. Attackers Exploit Zimbra CVE-2026-73570 to Compromise Internet-Facing Mail Servers
CVE-2026-73570, unauthenticated command injection through SNMP notification handling. Zimbra Vulnerabilities Could Let Attackers Manipulate Email, Documents and Calendars
CVE-2026-73570 Recorded Future Identifies 73 High-Impact Vulnerabilities in August, 70 Actively Exploited

CVE (75)

Malware (23)

Threat Actors (1)

MITRE ATT&CK (16)

Vendors (23)

Products (25)

Tools (8)

Industries (1)

Countries (2)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.