CVE-2026-73570
HighExploitedPublic exploitA 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.
Published Aug 13, 2026 · Updated Oct 8, 2026 · Also known as EUVD-2026-58069, GHSA-jqh7-pchh-v74j, TR-26-0836
Key Facts
Patch immediately- CVE-2026-73570 is a high-severity vulnerability (CVSS 8.9 v3.1) affecting Zimbra Collaboration Suite (Synacor), Collaboration (Zimbra).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 17, 2026. Public exploit code is available.
- EPSS estimates a 72% probability of exploitation in the next 30 days.
- Fixed versions are available, including Collaboration 10.1.20, Zimbra Collaboration Suite 10.1.20.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
EPSS (30-day exploit likelihood)
72%
Higher than 99.4% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Aug 21, 2026 | Aug 24, 2026 | Not reported |
| Industry KEV feed | Aug 17, 2026 | Aug 24, 2026 | Not reported |
| CIRCL KEV | Aug 17, 2026 | Aug 24, 2026 | Not reported |
| ENISA EUVD | Aug 18, 2026 | n/a | Not reported |
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 evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Affected Products
4 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Zimbra Collaboration SuiteSynacor | See advisory | 10.1.20 |
| CollaborationZimbra | See advisory | 10.1.20 |
Patched Releases
Collaboration
10.1.20
Zimbra Collaboration Suite
10.1.20
Timeline
Publicly disclosed
Aug 13, 2026
Added to Industry KEV feed
Aug 17, 2026
Added to CIRCL KEV
Aug 17, 2026
Added to ENISA EUVD
Aug 18, 2026
Added to CISA KEV
Aug 21, 2026
Last updated
Oct 8, 2026
Weakness Type
- CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
References
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73570.json
- advisoryVulnCheck exploitation report
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-73570
- advisoryUSOM advisory
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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.
Affected: Zimbra Collaboration Suite (Synacor); Collaboration (Zimbra). The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 17, 2026.
Yes. It was added on Aug 21, 2026 with a federal remediation due date of Aug 24, 2026.
Public exploit code is available.
Fixed versions are available, including Collaboration 10.1.20, Zimbra Collaboration Suite 10.1.20.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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