CVE-2023-50096Public exploit

MCU code execution via unchecked I2C length

Published Jan 1, 2024 · Updated Sep 9, 2024

Buffer overflow in STMicroelectronics STSAFE-A1xx middleware before 3.3.7 allows physically proximate attackers to execute MCU code. StSafeA_ReceiveBytes trusts a response length read from I2C data and passes it to a second HwCtx.BusRecv call without checking the 523-byte output buffer. Exploitation requires interception or injection of I2C responses between the MCU and STSAFE-A110, enabling code execution in firmware derived from affected sample applications.

CVSS severity7.5
High
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in STMicroelectronics STSAFE-A1xx middleware before 3.3.7 allows physically proximate attackers to execute MCU code. StSafeA_ReceiveBytes trusts a response length read from I2C data and passes it to a second HwCtx.BusRecv call without checking the 523-byte output buffer. Exploitation requires interception or injection of I2C responses between the MCU and STSAFE-A110, enabling code execution in firmware derived from affected sample applications.

The record

CVE
CVE-2023-50096
Published
Jan 1, 2024
Updated
Sep 9, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 1, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDCVSS:3.1/AV:A/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.

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

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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