What’s Vulnerable › Vulnerabilities

CVE-2022-35927: Unverified DIO prefix info lengths in RPL-Classic in Contiki-NG

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-08-04 · updated 2026-06-17
• Weakness: CWE-120

Description

Contiki-NG is an open-source, cross-platform operating system for IoT devices. In the RPL-Classic routing protocol implementation in the Contiki-NG operating system, an incoming DODAG Information Option (DIO) control message can contain a prefix information option with a length parameter. The value of the length parameter is not validated, however, and it is possible to cause a buffer overflow when copying the prefix in the set_ip_from_prefix function. This vulnerability affects anyone running a Contiki-NG version prior to 4.7 that can receive RPL DIO messages from external parties. To obtain a patched version, users should upgrade to Contiki-NG 4.7 or later. There are no workarounds for this issue.

Affected products

• contiki-ng: before 4.7 — fixed in 4.7

How to fix

Upgrade to a fixed version: contiki-ng 4.7. Check the vendor advisory for mitigations.

References

• https://github.com/contiki-ng/contiki-ng/pull/1589
• https://github.com/contiki-ng/contiki-ng/pull/1589/commits/4fffab0e632c4d01910fa957d1fd9ef321eb87d2
• https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-9rm9-3phh-p4wm
• https://github.com/contiki-ng/contiki-ng/pull/1589
• https://github.com/contiki-ng/contiki-ng/pull/1589/commits/4fffab0e632c4d01910fa957d1fd9ef321eb87d2
• https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-9rm9-3phh-p4wm

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