RCE in Zenitel Tcis-3+

CVE-2025-59817

This vulnerability allows attackers to execute arbitrary commands on the underlying system. Because the web portal runs with root privileges, successful exploitation grants full control over the device, potentially compromising its availability, confidentiality, and integrity.

Vulnerability class: Command Injection (OS Command Injection)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (14.3th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 14.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-59817: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-59817?
CVE-2025-59817 is a high-severity vulnerability in Zenitel Tcis-3+, classified under Command Injection. CVSS score: 8.4/10. Published 2025-09-25.
How severe is CVE-2025-59817?
High severity. CVSS v3 base score is 8.4 out of 10.
Is CVE-2025-59817 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.