CVE-2021-32771 Buffer overflow in contiki-ng
An attacker can trigger a buffer overflow in Contiki-NG's RPL implementation by sending a malformed DAO packet, potentially leading to code execution or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-32771?
CVE-2021-32771 is a high-severity memory corruption vulnerability in contiki-ng, published on 4 Aug 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-120
Which versions are affected by CVE-2021-32771?
It affects 1 product.
Products include Contiki-Ng Contiki-Ng.
How do I fix CVE-2021-32771?
No fix has been published for CVE-2021-32771 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-32771 being exploited?
There is no known exploitation of CVE-2021-32771 in the wild and no public exploit code.