VulnerabilityBleeping Computer
8.9 — CRITICAL
Hackers breached over 270 Zimbra servers in ongoing attacks
Threat actors have already compromised over 270 Zimbra instances in remote code execution attacks targeting a high-severity Zimbra Collaboration Suite (ZCS) vulnerability. [...]
🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview
Threat actors successfully breached over 270 Zimbra servers through remote code execution attacks exploiting a high-severity vulnerability in the ZCS email and collaboration suite, putting hundreds of millions of users worldwide at risk.
⚙️Technical Details
Affected Systems
Synacor Zimbra Collaboration Suite
Attack Vectors
NETWORK
💥Impact Assessment
Severity: critical
Who Is at Risk
hundreds of millions of users worldwide, including thousands of businesses and hundreds of government agencies
🛡️Recommended Actions
1Patch the ZCS email and collaboration suite with the latest version (10.1.20) as soon as possible
2Enable SNMP notifications only when necessary to prevent exploitation of the command injection weakness
3Monitor logs for suspicious activity, including unexpected restarts of the Zimbra service and files created in specific folders
📦Affected Products
Synacor Zimbra Collaboration Suite
🔐NVD Verified DataVERIFIED
CVE-2026-73570 ↗CVSS 8.9 — HIGH
Attack Vector
NETWORK
Complexity
HIGH
Vector String
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:LWeaknesses
CWE-78
Affected Products (CPE)
Synacor Zimbra Collaboration Suite
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