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Description
In BYD Atto3, an attacker can obtain an authentication key through Brute Force attack, which is permanently available. The authentication key enables flash to the Electronic Parking Break (EPB) and Supplemental Restoration System (SRS) related ECUs.
Basic information
Type
unreviewed
Severity
high Advisory on GitHub
Open advisory ↗ Repository advisory
—
Source code
Not specified Published (advisory)
2026-05-19 18:32:13 UTC
Updated
2026-05-19 21:33:04 UTC
NVD published
2026-05-19 18:16:19 UTC
EPSS Score
Score
Percentile
0.02%
6.96%
CVSS Scores
Base score
Version
Severity
Vector
7.5
3.1
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CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H
Click to expand
Attack vector (AV:P)
Hands-on access—USB, keyboard, opening the case—not something you do purely over the wire.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
CWEs
CWE id
Name
CWE-307
Improper Restriction of Excessive Authentication Attempts
cvelogic
Threat Intelligence