CVE-2025-59818
CVE-2025-59818 is a critical-severity vulnerability in Zenitel Tcis-3 Firmware with a CVSS 3.x base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-77.
Key facts
- Severity: Critical (CVSS 3.x base score 10.0)
- EPSS exploit prediction: 1% (44th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-206811
- Weakness: CWE-77
- Affected product: Zenitel Tcis-3 Firmware
- Published:
- Last modified:
Description
This vulnerability allows authenticated attackers to execute arbitrary commands on the underlying system using the file name of an uploaded file.
Frequently asked questions
- What is CVE-2025-59818?
- This vulnerability allows authenticated attackers to execute arbitrary commands on the underlying system using the file name of an uploaded file.
- How severe is CVE-2025-59818?
- CVE-2025-59818 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2025-59818 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-59818?
- CVE-2025-59818 affects Zenitel Tcis-3 Firmware. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2025-59818?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2025-59818 have an EU (EUVD) identifier?
- Yes. CVE-2025-59818 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206811.
- When was CVE-2025-59818 published?
- CVE-2025-59818 was published on 2026-02-04 and last updated on 2026-06-17.
References
- https://wiki.zenitel.com/wiki/Turbine_9.3_-_Release_notes
- https://wiki.zenitel.com/wiki/VSF-Display_Series_9.3_Release_Notes
- https://wiki.zenitel.com/wiki/VSF-Fortitude6_9.3_Release_Notes
- https://wiki.zenitel.com/wiki/VSF-Fortitude8_9.3_Release_Notes
- https://wiki.zenitel.com/wiki/ZIPS_9.3_-_Release_notes
- https://www.zenitel.com/sites/default/files/2025-12/A100K12333%20Zenitel%20Security%20Advisory.pdf
Affected products (1)
- cpe:2.3:o:zenitel:tcis-3_firmware:*:*:*:*:*:*:*:*
More vulnerabilities in Zenitel Tcis-3 Firmware
- CVE-2025-64090 — Critical (CVSS 10.0): This vulnerability allows authenticated attackers to execute commands via the hostname of the device.
- CVE-2025-64091 — High (CVSS 8.6): This vulnerability allows authenticated attackers to execute commands via the NTP-configuration of the device.
All CVEs affecting Zenitel Tcis-3 Firmware →
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