Is CVE-2021-28362 actively exploited?

No active exploitation of CVE-2021-28362 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-28362 be exploited remotely?

Yes. CVE-2021-28362 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-28362?

CVE-2021-28362 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2021-28362

HIGH

CVE-2021-28362

CWE-191Published: March 24, 2021· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official Description

An issue was discovered in Contiki through 3.0. When sending an ICMPv6 error message because of invalid extension header options in an incoming IPv6 packet, there is an attempt to remove the RPL extension headers. Because the packet length and the extension header length are unchecked (with respect to the available data) at this stage, and these variables are susceptible to integer underflow, it is possible to construct an invalid extension header that will cause memory corruption issues and lead to a Denial-of-Service condition. This is related to rpl-ext-header.c.

NVD Source

Technical Analysis

CVE-2021-28362 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.