What is CVE-2025-64091?

CVE-2025-64091 is a high-severity vulnerability in Zenitel Tcis-3, classified under OS Command Injection. CVSS score: 8.6/10. Published 2026-01-09.

How severe is CVE-2025-64091?

High severity. CVSS v3 base score is 8.6 out of 10.

RCE in Zenitel Tcis-3

CVE-2025-64091

This vulnerability allows authenticated attackers to execute commands via the NTP-configuration of the device.

Vulnerability class: Command Injection (OS Command Injection)

Published 2026-01-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (27.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

www.zenitel.com/sites/default/files/2025-12/A100K12333 Zenitel Security Advisor… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2025-64091?: CVE-2025-64091 is a high-severity vulnerability in Zenitel Tcis-3, classified under OS Command Injection. CVSS score: 8.6/10. Published 2026-01-09.
How severe is CVE-2025-64091?: High severity. CVSS v3 base score is 8.6 out of 10.