CVE-2024-21740Public exploit

Firmware extraction via suppressed debug-unlock erase

Published Jun 25, 2024 · Updated Aug 1, 2024

Improper access control in Artery AT32F415CBT7 and AT32F421C8T7 devices allows local users to extract protected flash contents. A voltage glitch or electromagnetic fault during debug unlock suppresses mass erasure while protection is cleared, leaving firmware readable through the debug interface. Exploitation requires hands-on access, fault-injection equipment, and precise timing; successful extraction exposes firmware and embedded secrets.

CVSS severity7.4
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Artery AT32F415CBT7 and AT32F421C8T7 devices allows local users to extract protected flash contents. A voltage glitch or electromagnetic fault during debug unlock suppresses mass erasure while protection is cleared, leaving firmware readable through the debug interface. Exploitation requires hands-on access, fault-injection equipment, and precise timing; successful extraction exposes firmware and embedded secrets.

The record

CVE
CVE-2024-21740
Published
Jun 25, 2024
Updated
Aug 1, 2024
Vendor
Artery Technology
Product
AT32F415CBT7
Classifications
CWE-284, T1005
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=0 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Artery Technology · AT32F415CBT7version=0 <*
Artery Technology · AT32F421C8T7version=0 <*

Published CVSS scores

7.4CISA-ADPCVSS:3.1/AV:L/AC:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
T1005Data from Local System

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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