CVE-2026-73570

Analyzed
Published: 13 Aug 2026, 15:19
Last modified:21 Aug 2026, 17:27

Vulnerability Summary

Overall Risk (default)
medium
36/100
CVSS Score
8.9 HIGH
v3.1 (cve.org)
EPSS Score
0.54% LOW
1% probability 0.00%
KEV
Listed
CISA
1 listing
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

13 Aug 2026, 15:19
Published
Vulnerability first disclosed
21 Aug 2026, 00:00
Added to CISA KEV
Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability
21 Aug 2026, 17:27
Last Modified
Vulnerability information updated
24 Aug 2026, 00:00
CISA Remediation Due
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.

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.

CVSS Metrics

  • v3.1•HIGH•Score: 8.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L

EPSS Trends

Current EPSS score: 0.54%• Percentile: 43%

Techniques & Countermeasures

  • CWE-78•Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

    The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

Affected Systems

  • synacor•zimbra_collaboration_suite

    < 10.1.20

  • zimbra•collaboration

    < 10.1.20

References (4)