CVE-2023-6249

Local memory corruption via negative IPM size

Published Feb 18, 2024 · Updated Aug 2, 2024

Buffer overflow in the ESP32 IPM driver in Zephyr RTOS 3.5 and earlier allows local users to corrupt memory via a negative size. esp32_ipm_send compares the signed size against the shared-memory capacity, so a negative value passes the bound check and becomes a large unsigned length for memcpy. A caller able to invoke the IPM send path with a negative length can overwrite shared memory, interrupting the device and compromising data integrity.

CVSS severity8.0
High
EPSS probability0.44%
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 the ESP32 IPM driver in Zephyr RTOS 3.5 and earlier allows local users to corrupt memory via a negative size. esp32_ipm_send compares the signed size against the shared-memory capacity, so a negative value passes the bound check and becomes a large unsigned length for memcpy. A caller able to invoke the IPM send path with a negative length can overwrite shared memory, interrupting the device and compromising data integrity.

The record

CVE
CVE-2023-6249
Published
Feb 18, 2024
Updated
Aug 2, 2024
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-704
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=* <=3.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=* <=3.5

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.0Zephyr ProjectCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-704Incorrect Type Conversion or Cast

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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