Security readout for executives and security teams
Plain-English summary
A Tesla TCU firmware flaw before v2025.14 could let someone with physical access to the externally reachable USB interface bypass ADB lockdown and gain root-level control of the TCU. This is not a remote internet exploit in the provided sources, but it is serious for vehicles or units an attacker can physically reach.
Executive priority
Prioritize remediation for fleets, service environments, shared vehicles, and high-value targets where physical access is plausible. This is high severity because compromise can reach root privileges on the TCU, but urgency depends on firmware state and physical exposure.
Technical view
The sources describe an authentication bypass in Tesla TCU firmware prior to v2025.14. adbd runs as root and lockdown blocks adb shell, but still allows privileged ADB capabilities. With physical USB access, that exposure can be abused to cause attacker-controlled file execution with root privileges. CVSS 4.0 score is 8.6.
Likely exposure
Exposure appears limited to Tesla Telematics Control Units running firmware before v2025.14 where an attacker can physically access the external USB path. The bundle does not identify broad remote exposure, cloud exposure, or non-Tesla affected products.
Exploitation context
The NCC Group reference is tagged as exploit, and the description outlines a viable local physical attack path. The bundle does not show CISA KEV listing or active in-the-wild exploitation evidence, so active exploitation should not be assumed.
Researcher notes
Key evidence is source-reported behavior: root adbd remains capable despite lockdown restrictions. The public bundle does not provide a Tesla-specific advisory beyond the version threshold, nor evidence of KEV status. Avoid assuming remote exploitability or affected products outside Tesla TCU firmware before v2025.14.
Mitigation direction
- Update affected Tesla TCU firmware to v2025.14 or later where available.
- Check Tesla and vendor guidance for model-specific remediation details.
- Restrict physical access to vehicles and TCU USB interfaces.
- Review service, rental, fleet, and repair workflows for unsupervised device access.
- Track NCC Group, VulnCheck, and CVE updates for revised guidance.
Validation and detection
- Inventory Tesla assets with TCUs and record firmware versions.
- Confirm whether each TCU is on v2025.14 or later.
- Identify vehicles or lab units with externally reachable USB access.
- Review physical custody logs for high-risk vehicles or components.
- Monitor advisory sources for any active exploitation updates.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-269: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-288: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-34251 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.6 (4.0)
- Known Exploited
- No
- Published
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
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
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——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
8.6HighVector: 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
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.tesla.com/CVE reference, VulnCheck · product
- https://www.nccgroup.com/research-blog/technical-advisory-tesla-telematics-control-unit-adb-auth-bypass/CVE reference, VulnCheck · technical-description, exploit
- https://www.vulncheck.com/advisories/tesla-tcu-auth-bypassCVE reference, VulnCheck · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Privilege Management
Improper Privilege Management represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Authentication Bypass Using an Alternate Path or Channel
Authentication Bypass Using an Alternate Path or Channel represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.