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Known exploited vulnerability

CVE-2026-73570

highCVSS 3.1 8.9In CISA KEVEPSS 77%Published · Zimbra

The short answer

CVE-2026-73570 affects Zimbra Collaboration and is rated high (CVSS 8.9). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-08-21: attackers are using it, so patch it first.

What it is

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.

Weakness: CWE-78.

Severity

8.9 high

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

Exploited (CISA KEV)

Yes, since Aug 21, 2026

Federal due date Aug 24, 2026

EPSS, next 30 days

77%

Higher than 100% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
High
Availability impact
Low

What CISA says to do

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…

Affected products

Collaboration. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-73570 being exploited?

Yes. CISA added CVE-2026-73570 to its Known Exploited Vulnerabilities catalog on 2026-08-21, with a federal remediation due date of 2026-08-24.

How do I fix CVE-2026-73570?

CISA's 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…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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