CVE-2023-0359Public exploitNetwork attack vector

Remote denial of service via IPv6 null dereference

Published Jul 10, 2023 · Updated Nov 12, 2024

Improper input validation in Zephyr RTOS 3.2 and earlier allows remote attackers to crash devices via a crafted IPv6 router advertisement. In handle_ra_input, the reachable_time update passes net_pkt_iface(pkt)->config.ip.ipv6 to net_if_ipv6_set_reachable_time without verifying that the interface pointer is non-null. An unauthenticated network peer must supply a qualifying router-advertisement reachable-time value; dereferencing the null pointer interrupts the affected device, with no reported confidentiality or integrity impact.

CVSS severity5.9
Medium
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Zephyr RTOS 3.2 and earlier allows remote attackers to crash devices via a crafted IPv6 router advertisement. In handle_ra_input, the reachable_time update passes net_pkt_iface(pkt)->config.ip.ipv6 to net_if_ipv6_set_reachable_time without verifying that the interface pointer is non-null. An unauthenticated network peer must supply a qualifying router-advertisement reachable-time value; dereferencing the null pointer interrupts the affected device, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2023-0359
Published
Jul 10, 2023
Updated
Nov 12, 2024
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-476, CWE-20, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 12, 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=* <=2.7.4
  2. Affected versionversion=* <=3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=* <=2.7.4; version=* <=3.2

Published CVSS scores

7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.9Zephyr ProjectCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
CWE-20Improper Input Validation
T1499Endpoint Denial of Service

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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