CVE-2023-31129Network attack vector

Device crash via unchecked neighbor entry pointer

Published May 8, 2023 · Updated Jan 29, 2025

NULL pointer dereference in Contiki-NG 4.8 and earlier allows remote attackers to crash devices via crafted IPv6 Router Solicitations. In os/net/ipv6/uip-nd6.c, the Router Solicitation handler uses the unchecked result of uip_ds6_nbr_add after an SLLAO address change. An unauthenticated attacker must reach the device's IPv6 Neighbor Discovery interface; triggering the fault interrupts the affected node.

CVSS severity7.5
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Contiki-NG 4.8 and earlier allows remote attackers to crash devices via crafted IPv6 Router Solicitations. In os/net/ipv6/uip-nd6.c, the Router Solicitation handler uses the unchecked result of uip_ds6_nbr_add after an SLLAO address change. An unauthenticated attacker must reach the device's IPv6 Neighbor Discovery interface; triggering the fault interrupts the affected node.

The record

CVE
CVE-2023-31129
Published
May 8, 2023
Updated
Jan 29, 2025
Vendor
Contiki-NG
Product
Contiki-NG
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 29, 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=<= 4.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Contiki-NG · Contiki-NGversion=<= 4.8

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application 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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