High severity8.1NVD Advisory· Published Aug 4, 2022· Updated Jun 17, 2026
CVE-2021-32771
CVE-2021-32771
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3cpe:2.3:o:contiki-ng:contiki-ng:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:contiki-ng:contiki-ng:*:*:*:*:*:*:*:*range: <4.8
- (no CPE)range: < 4.8
- Range: <4.7
Patches
Vulnerability mechanics
References
4- github.com/contiki-ng/contiki-ng/pull/1615nvdPatchThird Party Advisory
- github.com/contiki-ng/contiki-ng/pull/1615/commits/587ae59956e00316fd44fd7072ac3a6a07b4b20fnvdPatchThird Party Advisory
- github.com/contiki-ng/contiki-ng/releases/tag/release%2Fv4.8nvdThird Party Advisory
- github.com/contiki-ng/contiki-ng/security/advisories/GHSA-jqjf-v7v9-xp6wnvdThird Party Advisory
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