CVE-2026-73570

Published Aug 13, 2026

Last updated 2 months ago

Exploit known CVSS high 8.9

Zimbra Collaboration

SMTP

ZCS

Overview

AI description

Automated description summarized from trusted sources.

CVE-2026-73570 is a remote code execution vulnerability identified in Zimbra Collaboration (ZCS) versions prior to 10.1.20. This flaw specifically impacts systems where the optional `zimbra-snmp` package is installed and SNMP notifications are enabled. The vulnerability arises from inadequate sanitization of untrusted input during the processing of SNMP notifications. An unauthenticated attacker can exploit this by sending specially crafted SMTP requests, which can lead to the execution of arbitrary operating system commands with the privileges of the Zimbra user. This vulnerability has been actively exploited in the wild.

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.
Source: cve@mitre.org
NVD status: Analyzed
Products: zimbra_collaboration_suite

Risk scores

CVSS 3.1

Type: Secondary
Base score: 8.9
Impact score: 6
Exploitability score: 2.2
Vector string: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
Severity: HIGH

Known exploits

Data from CISA

Vulnerability name: Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability
Exploit added on: Aug 21, 2026
Exploit action due: Aug 24, 2026
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.

Weaknesses

cve@mitre.org: CWE-78

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "2DA7AB29-C275-4B2D-AC7F-288B3121779F",
            "versionEndExcluding": "10.1.20",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.