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.

• CWE-125

• https://github.com/contiki-ng/contiki-ng/pull/1482Patch, Third Party Advisory
• https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-hhwj-2p59-v8p9Patch, Third Party Advisory
• https://github.com/contiki-ng/contiki-ng/pull/1482Patch, Third Party Advisory
• https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-hhwj-2p59-v8p9Patch, Third Party Advisory

Published

Jun 18, 2021

Last Modified

Jun 17, 2026

Status

Modified

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