CVE-2026-73570
High8.9CISA KEV — exploited in the wildA 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
- 8.9v3.1
- EPSS (exploit probability)
- 71.7%99th pct
- CISA KEV
- Listed
EPSS trendFIRST daily scores, last 90 days
Daily values
| Score date | EPSS | Percentile |
|---|---|---|
| 2026-10-20 | 71.7% | 99.4% |
| 2026-10-19 | 71.7% | 99.4% |
| 2026-10-18 | 71.7% | 99.4% |
| 2026-10-16 | 71.7% | 99.4% |
| 2026-10-15 | 71.7% | 99.4% |
| 2026-10-14 | 71.7% | 99.4% |
| 2026-10-13 | 71.7% | 99.4% |
| 2026-10-12 | 71.7% | 99.4% |
| 2026-10-11 | 71.7% | 99.4% |
| 2026-10-10 | 71.7% | 99.4% |
| 2026-10-09 | 71.7% | 99.4% |
| 2026-10-08 | 71.7% | 99.4% |
| 2026-10-07 | 71.7% | 99.4% |
| 2026-10-06 | 71.7% | 99.4% |
| 2026-10-05 | 11.9% | 96.0% |
| 2026-10-04 | 11.7% | 96.0% |
| 2026-10-03 | 11.7% | 96.0% |
| 2026-10-02 | 11.7% | 96.0% |
| 2026-10-01 | 11.7% | 96.0% |
| 2026-09-30 | 11.7% | 95.9% |
| 2026-09-29 | 11.7% | 95.9% |
| 2026-09-27 | 11.7% | 95.9% |
| 2026-09-26 | 11.7% | 95.9% |
| 2026-09-25 | 11.7% | 95.9% |
| 2026-09-24 | 11.7% | 95.9% |
| 2026-09-23 | 32.4% | 98.3% |
| 2026-09-22 | 32.4% | 98.3% |
| 2026-09-21 | 32.4% | 98.3% |
| 2026-09-20 | 32.4% | 98.3% |
| 2026-09-19 | 32.4% | 98.3% |
| 2026-09-18 | 32.4% | 98.3% |
CISA KEV entrycatalogue 2026.10.20
- Date added
- 2026-08-21
- Federal due date
- 2026-08-24
- Known ransomware use
- Unknown
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.
Verbatim from the CISA KEV catalogue (CISA KEV, fetched 2026-10-21 14:34 UTC). The due date applies to US federal agencies under BOD 22-01.
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