CVE-2026-73570Known exploitationNetwork attack vectorHinoki check available

Unauthenticated command execution via SNMP notifications

Published Aug 13, 2026 · Updated Aug 13, 2026

OS command injection in Zimbra Collaboration before 10.1.20 allows remote attackers to execute commands through crafted SMTP requests. SNMP notification processing fails to sanitize SMTP-derived input before incorporating it into an operating-system command. Exploitation requires zimbra-snmp, snmp_notify enabled, and swatchdog running; commands execute as the zimbra user.

CVSS severity8.9
High
EPSS probability32.38%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

OS command injection in Zimbra Collaboration before 10.1.20 allows remote attackers to execute commands through crafted SMTP requests. SNMP notification processing fails to sanitize SMTP-derived input before incorporating it into an operating-system command. Exploitation requires zimbra-snmp, snmp_notify enabled, and swatchdog running; commands execute as the zimbra user.

The record

CVE
CVE-2026-73570
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Zimbra
Product
Zimbra Collaboration
Classifications
CWE-78, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <10.1.20

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zimbra · Zimbra Collaborationversion=0 <10.1.20

Published CVSS scores

8.9MITRECVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Reported exploitation

Technologies

Your stack

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Your stack

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