High severity · published Nov 26, 2025
CVE-2025-64129
Zenitel TCIV-3+ Out-of-bounds Write
7.6
CVSS
0.5%
EPSS
No
On KEV
Description
Zenitel TCIV-3+ is vulnerable to an out-of-bounds write
vulnerability, which could allow a remote attacker to crash the device.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TC
TCIV-3+ · Zenitel
through 9.3.3.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-64129
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-64129
github.com
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2025/icsa-25-329-03.json
wiki.zenitel.com
https://wiki.zenitel.com/wiki/Downloads#Station_and_Device_Firmware_Package_.28VS-IS.29
www.cisa.gov
https://www.cisa.gov/news-events/ics-advisories/icsa-25-329-03
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