Out-of-bounds Read in Contiki-Ng
CVE-2021-21410
Contiki-NG is an open-source, cross-platform operating system for Next-Generation IoT devices. An out-of-bounds read can be triggered by 6LoWPAN packets sent to devices running Contiki-NG 4.6 and prior. The IPv6 header decompression function (<code>uncompress_hdr_iphc</code>) does not perform proper boundary checks when reading from the packet buffer. Hence, it is possible to construct a compressed 6LoWPAN packet that will read more bytes than what is available from the packet buffer. As of time of publication, there is not a release with a patch available. Users can apply the patch for this vulnerability out-of-band as a workaround.
Vulnerability class: Buffer Overflow
EPSS: 0.012 (65.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L.
Affected products
- Contiki-ng — versions <= 4.6
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Third Party Advisory)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-21410?
- CVE-2021-21410 is a high-severity vulnerability in Contiki-Ng, classified under Out-of-bounds Read. CVSS score: 8.2/10. Published 2021-06-18.
- How severe is CVE-2021-21410?
- High severity. CVSS v3 base score is 8.2 out of 10.