CVE-2026-73570
Unauthenticated RCE in Zimbra via SNMP-enabled zimbra-snmp (pre-10.1.20)
Is CVE-2026-73570 being exploited?
Yes. CVE-2026-73570 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.
How severe is CVE-2026-73570?
CVE-2026-73570 is rated High with a CVSS score of 8.9. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-73570?
Yes. A fix has been recorded for CVE-2026-73570. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-73570 affect?
CVE-2026-73570 affects Zimbra Collaboration Suite (ZCS) < 10.1.20 with zimbra-snmp installed, Zimbra mail servers with SNMP notifications enabled, Hosts (Linux/Unix) running affected ZCS versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-73570?
Upgrade to ZCS 10.1.20 or disable zimbra-snmp/SNMP notifications until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote unauthenticated attacker can execute arbitrary OS commands as the Zimbra user via crafted SMTP requests.
Immediate action required
- affected< 10.1.20
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.