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CVE-2026-73570

Zimbra Collaboration Suite (ZCS) OS Command Injection

8.9 HIGHActively exploited (CISA KEV)EPSS 71.7%
  1. Published13 Aug 2026
  2. Added to CISA KEV21 Aug 2026
  3. Remediation due24 Aug 2026
Actively exploited (CISA KEV)

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.

Added to KEV: 21 Aug 2026Federal remediation due: 24 Aug 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityLow
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L

Affected products

Synacor Zimbra Collaboration Suite< 10.1.20

Remediation

Fixed in
Synacor Zimbra Collaboration Suite≥ 10.1.20

References

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Frequently asked

Is CVE-2026-73570 being actively exploited?

Yes. CVE-2026-73570 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 21 Aug 2026.

How severe is CVE-2026-73570?

CVE-2026-73570 has a CVSS 3.1 base score of 8.9, rated high. EPSS estimates a 71.7% probability of exploitation.

Which products are affected by CVE-2026-73570?

Affected products include Synacor Zimbra Collaboration Suite.

How do I fix CVE-2026-73570?

Upgrade affected software to a fixed version, for example Synacor Zimbra Collaboration Suite 10.1.20 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-73570 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.