CVE-2023-4259

Service interruption via unchecked eS-WiFi buffer copies

Published Sep 25, 2023 · Updated Feb 13, 2025

Buffer overflows in Zephyr RTOS before 3.4 allow physically proximate attackers to interrupt service or disclose data through eS-WiFi input. eswifi_mgmt_iface_status uses strcpy to copy a 33-byte SSID into a 32-byte destination, while eswifi_shell_atcmd repeatedly appends unchecked arguments to a fixed buffer. The affected paths require attacker-controlled SSID or shell input to cross a security boundary; the reported crash and code-execution outcomes remain unverified on a live installation.

CVSS severity7.1
High
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflows in Zephyr RTOS before 3.4 allow physically proximate attackers to interrupt service or disclose data through eS-WiFi input. eswifi_mgmt_iface_status uses strcpy to copy a 33-byte SSID into a 32-byte destination, while eswifi_shell_atcmd repeatedly appends unchecked arguments to a fixed buffer. The affected paths require attacker-controlled SSID or shell input to cross a security boundary; the reported crash and code-execution outcomes remain unverified on a live installation.

The record

CVE
CVE-2023-4259
Published
Sep 25, 2023
Updated
Feb 13, 2025
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-120, CWE-193, CAPEC-100, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 25, 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=1.14 <3.4

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=1.14 <3.4

Published CVSS scores

7.1Zephyr ProjectCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
8.8NIST NVDCVSS:3.1/AV:A/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-193Off-by-one Error
CAPEC-100Overflow Buffers
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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