CVE-2024-46442Public exploit

Authentication bypass via unrestricted two-byte key search

Published Dec 10, 2024 · Updated Jul 5, 2026

Authentication bypass in BYD DiLink Headunit System 3.0 through 4.0 allows physically proximate attackers to enter programming mode via CAN. The ISO 14229 service 0x27 repeatedly exposes a fixed-length two-byte seed and accepts two-byte key guesses without restricting failed attempts, making exhaustive key search practical. Access to the vehicle's CAN bus is required; successful authentication permits sensitive diagnostic operations, including firmware-flashing services.

CVSS severity9.8
Critical
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in BYD DiLink Headunit System 3.0 through 4.0 allows physically proximate attackers to enter programming mode via CAN. The ISO 14229 service 0x27 repeatedly exposes a fixed-length two-byte seed and accepts two-byte key guesses without restricting failed attempts, making exhaustive key search practical. Access to the vehicle's CAN bus is required; successful authentication permits sensitive diagnostic operations, including firmware-flashing services.

The record

CVE
CVE-2024-46442
Published
Dec 10, 2024
Updated
Jul 5, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-307, T1110
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 10, 2024CVE publishedPublication date reported by the CVE source.
  2. Jul 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA ADP VulnrichmentCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-307Improper Restriction of Excessive Authentication Attempts
T1110Brute Force

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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