CVE-2021-21410

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    CVE-2021-21410

    Published: 18 Jun 2021Last Modified: 11 Feb 2026

    Summary:

    Details: 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.

    References: https://github.com/contiki-ng/contiki-ng/pull/1482, https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-hhwj-2p59-v8p9, https://github.com/contiki-ng/contiki-ng/pull/1482, https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-hhwj-2p59-v8p9

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    2.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-21410 | CVE-DB