CVE-2021-21280: contiki-ng Out-of-bounds Write

Vulnerability summary

CVE-2021-21280 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in contiki-ng. EPSS estimates a 1.06% chance of exploitation in the next 30 days, higher than 64.3% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 18-06-2021
   PublishedVulnerability first disclosed.
2. 03-08-2024
   Last modifiedVulnerability information updated.

Description

Contiki-NG is an open-source, cross-platform operating system for internet of things devices. It is possible to cause an out-of-bounds write in versions of Contiki-NG prior to 4.6 when transmitting a 6LoWPAN packet with a chain of extension headers. Unfortunately, the written header is not checked to be within the available space, thereby making it possible to write outside the buffer. The problem has been patched in Contiki-NG 4.6. Users can apply the patch for this vulnerability out-of-band as a workaround.

• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.