CVE-2021-32771

Contiki-NG is an open-source, cross-platform operating system for IoT devices. In affected versions it is possible to cause a buffer overflow when copying an IPv6 address prefix in the RPL-Classic implementation in Contiki-NG. In order to trigger the vulnerability, the Contiki-NG system must have joined an RPL DODAG. After that, an attacker can send a DAO packet with a Target option that contains a prefix length larger than 128 bits. The problem was fixed after the release of Contiki-NG 4.7. Users unable to upgrade may apply the patch in Contiki-NG PR #1615.

• CWE-120

• https://github.com/contiki-ng/contiki-ng/pull/1615Patch, Third Party Advisory
• https://github.com/contiki-ng/contiki-ng/pull/1615/commits/587ae59956e00316fd44fd7072ac3a6a07b4b20fPatch, Third Party Advisory
• https://github.com/contiki-ng/contiki-ng/releases/tag/release%2Fv4.8Third Party Advisory
• https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-jqjf-v7v9-xp6wThird Party Advisory
• https://github.com/contiki-ng/contiki-ng/pull/1615Patch, Third Party Advisory
• https://github.com/contiki-ng/contiki-ng/pull/1615/commits/587ae59956e00316fd44fd7072ac3a6a07b4b20fPatch, Third Party Advisory
• https://github.com/contiki-ng/contiki-ng/releases/tag/release%2Fv4.8Third Party Advisory
• https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-jqjf-v7v9-xp6wThird Party Advisory

Published

Aug 4, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2021-32766Nextcloud Text is an open source plaintext editing applicati…5.3
• CVE-2021-32767TYPO3 is an open source PHP based web content management sys…6.5
• CVE-2021-32768TYPO3 is an open source PHP based web content management sys…6.1
• CVE-2021-32769Micronaut is a JVM-based, full stack Java framework designed…7.5
• CVE-2021-3277Nagios XI 5.7.5 and earlier allows authenticated admins to u…7.2
• CVE-2021-32770Gatsby is a framework for building websites. The gatsby-sour…7.5
• CVE-2021-32772Poddycast is a podcast app made with Electron. Prior to vers…8.8
• CVE-2021-32773Racket is a general-purpose programming language and an ecos…7.5
• CVE-2021-32774DataDump is a MediaWiki extension that provides dumps of wik…5.4
• CVE-2021-32775Combodo iTop is a web based IT Service Management tool. In v…6.5
• CVE-2021-32776Combodo iTop is a web based IT Service Management tool. In v…8.8
• CVE-2021-32777Envoy is an open source L7 proxy and communication bus desig…8.3