CVE-2023-4257

Memory corruption via unchecked Wi-Fi credential lengths

Published Oct 13, 2023 · Updated Feb 13, 2025

Buffer overflow in Zephyr Project Zephyr RTOS 3.4.0 and earlier allows adjacent attackers to corrupt memory via Wi-Fi shell input. The __wifi_args_to_params function assigns SSID and PSK arguments and their lengths without enforcing the defined credential bounds. Exploitation requires an enabled Wi-Fi shell and user interaction; published analysis bounds the consequence to device crashes or arbitrary code execution.

CVSS severity7.6
High
EPSS probability0.87%
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 Zephyr Project Zephyr RTOS 3.4.0 and earlier allows adjacent attackers to corrupt memory via Wi-Fi shell input. The __wifi_args_to_params function assigns SSID and PSK arguments and their lengths without enforcing the defined credential bounds. Exploitation requires an enabled Wi-Fi shell and user interaction; published analysis bounds the consequence to device crashes or arbitrary code execution.

The record

CVE
CVE-2023-4257
Published
Oct 13, 2023
Updated
Feb 13, 2025
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-131, CWE-120, CAPEC-100, T1203
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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?

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

  1. Affected versionversion=0 <=3.4

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=0 <=3.4

Published CVSS scores

6.8GitHub Security AdvisoryCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
7.6Zephyr Project CNACVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
9.8NIST NVDCVSS: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.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-131Incorrect Calculation of Buffer Size
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CAPEC-100Overflow Buffers
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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