PatchTheCVECVE-2021-28362: An issue was discovered in Contiki through 3.0
CVE-2021-28362 is a high-severity flaw (CVSS 7.5) affecting contiki. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 heade
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.4% (top 28%) |
| CISA exploited list | No |
| Weakness | CWE-191 |
| Published | 2021-03-24 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-28362?
contiki: upgrade to newer than 3.0. Exact commands for each OS are on this page.
Is CVE-2021-28362 being exploited?
CVE-2021-28362 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-28362 affect?
CVE-2021-28362 affects contiki. Severity is high (CVSS 7.5). 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
How urgent is CVE-2021-28362?
Priority 49/100. High severity; Remotely exploitable, no login, no user action
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