CVE-2023-26243Public exploit

Firmware-key disclosure via retained printf routine

Published Apr 27, 2023 · Updated Jan 31, 2025

Information disclosure in Hyundai Gen5W_L firmware AE_E_PE_EUR.S5W_L001.001.211214 allows local users to recover encryption secrets. DecryptToPIPE statically links an unused mbedtls_printf routine; a patched copy can pass register or stack values to it and print key material from memory. Local access to the firmware image and binary modification is required; the recovered AES-CBC key and derived IVs enable encrypted custom firmware for later USB installation.

CVSS severity7.8
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Hyundai Gen5W_L firmware AE_E_PE_EUR.S5W_L001.001.211214 allows local users to recover encryption secrets. DecryptToPIPE statically links an unused mbedtls_printf routine; a patched copy can pass register or stack values to it and print key material from memory. Local access to the firmware image and binary modification is required; the recovered AES-CBC key and derived IVs enable encrypted custom firmware for later USB installation.

The record

CVE
CVE-2023-26243
Published
Apr 27, 2023
Updated
Jan 31, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-269, CWE-22, T1601.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 31, 2025Record 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 vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-269Improper Privilege Management
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1601.001Patch System Image

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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