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CVE-2026-73570

A remote code execution vulnerability exists in Zimbra Collaboration (ZCS) before 10.1.20 when...

8.9 HighIn KEVPublic exploit

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
Low

Exploit likelihood

71.7%Up 71.1 points since Aug 14, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.9

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.

Record
CVE-2026-73570
CVSS 3.1
8.9 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
Weakness
CWE-78
Updated
2026-11-02
EUVDEUVD-2026-58069 8.9

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.

Record
EUVD-2026-58069
CVSS 3.1
8.9 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-jqh7-pchh-v74j 8.9

A remote code execution vulnerability exists in Zimbra Collaboration (ZCS) before 10.1.20 when...

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.

Record
GHSA-jqh7-pchh-v74j
CVSS 3.1
8.9 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
Weakness
CWE-78
Updated
2026-11-02
CISA KEV No score

Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability

Zimbra Collaboration Suite (ZCS) contains an OS command injection vulnerability which could allow an unauthenticated attacker to send specially crafted SMTP requests that may result in execution of arbitrary operating system commands as the Zimbra user.

Record
CVE-2026-73570
Weakness
CWE-78
Updated
2026-11-02
NVD 8.9

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.

Record
CVE-2026-73570
CVSS 3.1
8.9 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
Weakness
CWE-78
Updated
2026-11-02
OSV 8.9

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.

Record
CVE-2026-73570
CVSS 3.1
8.9 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
Weakness
CWE-78
Updated
2026-11-04

Affected products

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHubHORKimhab/CVE-2026-735702026-08-21
PoC in GitHubBiuTrap/CVE-2026-735702026-08-24
PoC in GitHubjishino567/CVE-2026-735702026-08-25
PoC in GitHubgabrielunknown/CVE-2026-735702026-08-26
PoC in GitHubINFOKOM-KI/Zimbra-CVE-2026-73570-Rules2026-08-28
PoC in GitHubdahnutz/zimbra-cve-2026-73570-ir2026-09-04
PoC in GitHubjuanpoch/CVE-2026-735702026-09-05
PoC in GitHubhainhc/CVE-2026-735702026-09-10
PoC in GitHub0xBlackash/CVE-2026-735702026-09-30
NucleiZimbra Collaboration Suite < 10.1.20 - OS Command Injection

History

History
RecordedChangedSources
exploitation, exploits
first indexedCVE List, EUVD, GitHub Advisories, CISA KEV, Nuclei, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-73570 is a high vulnerability (CVSS 8.9) in Zimbra Collaboration, published August 13, 2026. CISA lists it as known to be exploited, since August 21, 2026. EUVD reports exploitation since August 18, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 71.7%, the 99th percentile. No source names a fixed version.

References

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