PatchTheCVECVE-2019-12797: A clone version of an ELM327 OBD2 Bluetooth device has a hardcoded PIN, leading to arbitrary commands to an OB
CVE-2019-12797 is a critical-severity flaw (CVSS 9.8) affecting elm27 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A clone version of an ELM327 OBD2 Bluetooth device has a hardcoded PIN, leading to arbitrary commands to an OBD-II bus of a vehicle.
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.2% (top 32%) |
| CISA exploited list | No |
| Weakness | CWE-798 |
| Published | 2019-07-31 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2019-12797?
elm27 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2019-12797 being exploited?
CVE-2019-12797 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2019-12797 affect?
CVE-2019-12797 affects elm27 firmware. Severity is critical (CVSS 9.8). A clone version of an ELM327 OBD2 Bluetooth device has a hardcoded PIN, leading to arbitrary commands to an OBD-II bus of a vehicle.
How urgent is CVE-2019-12797?
Priority 56/100. Critical severity; Remotely exploitable, no login, no user action