CVE-2022-35926Network attack vector

Service interruption via unchecked neighbor solicitation options

Published Aug 4, 2022 · Updated Apr 23, 2025

Out-of-bounds read in IPv6 neighbor discovery in Contiki-NG before 4.8 allows remote attackers to interrupt service via crafted solicitations. The parser in os/net/ipv6/uip-nd6.c reads the two-byte option header and Source Link-Layer Address Option from uip_buf without first verifying that each read remains within the packet buffer. IPv6 must be enabled and the device must process the malicious neighbor solicitation; published assessments report availability impact without data disclosure or modification.

CVSS severity5.9
Medium
EPSS probability1.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in IPv6 neighbor discovery in Contiki-NG before 4.8 allows remote attackers to interrupt service via crafted solicitations. The parser in os/net/ipv6/uip-nd6.c reads the two-byte option header and Source Link-Layer Address Option from uip_buf without first verifying that each read remains within the packet buffer. IPv6 must be enabled and the device must process the malicious neighbor solicitation; published assessments report availability impact without data disclosure or modification.

The record

CVE
CVE-2022-35926
Published
Aug 4, 2022
Updated
Apr 23, 2025
Vendor
Contiki-NG
Product
Contiki-NG
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 4, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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

7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.9GitHubCVSS: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.

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-125Out-of-bounds Read
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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