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    CVE-2023-33973

    RIOT-OS, an operating system for Internet of Things (IoT) devices, contains a network stack with the ability to process 6LoWPAN frames. In versions 2023.01 and prior, an attacker can send a crafted frame which is forwarded by the device. During encoding of the packet a NULL pointer dereference occurs. This crashes the device leading to denial of service. A patch is available at pull request 19678. There are no known workarounds.

    Published:May 30, 2023
    Last Modified:Jan 10, 2025
    EPS:May 30, 2023
    EPSS Score:0.00218
    CVSS Score:7.5

    Affected Products

    Vendor
    Riot-os
    Product
    Riot

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-476 NULL Pointer Dereference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-27703 (CVSS 7.5) — RIOT is an open-source microcontroller operating system, designed to match the requirements of Internet of Thi…
    CVE-2026-25139 (CVSS 8.7) — RIOT is an open-source microcontroller operating system, designed to match the requirements of Internet of Thi…
    CVE-2026-22214 (CVSS 6.8) — RIOT OS versions up to and including 2026.01-devel-317 contain a stack-based buffer overflow vulnerability in …
    CVE-2026-22213 (CVSS 2.4) — RIOT OS versions up to and including 2026.01-devel-317 contain a stack-based buffer overflow vulnerability in …
    CVE-2025-66647 (CVSS 1.7) — RIOT is an open-source microcontroller operating system, designed to match the requirements of Internet of Thi…
    CVE-2025-66646 (CVSS 1.7) — RIOT is an open-source microcontroller operating system, designed to match the requirements of Internet of Thi…
    CVE-2025-53888 (CVSS 6.6) — RIOT-OS, an operating system that supports Internet of Things devices, has an ineffective size check implement…
    CVE-2024-53980 (CVSS 6.9) — RIOT is an open-source microcontroller operating system, designed to match the requirements of Internet of Thi…
    CVE-2024-52802 (CVSS 7.5) — RIOT is an operating system for internet of things (IoT) devices. In version 2024.04 and prior, the function `…
    CVE-2024-32018 (CVSS 8.8) — RIOT is a real-time multi-threading operating system that supports a range of devices that are typically 8-bit…

    References

    https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1067
    https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1495
    https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1511
    https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1644
    https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1655
    https://github.com/RIOT-OS/RIOT/commit/c9d7863e5664a169035038628029bb07e090c5ff
    https://github.com/RIOT-OS/RIOT/pull/19678
    https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-r2pv-3jqc-vh7w
    https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1067
    https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1495
    https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1511
    https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1644
    https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1655
    https://github.com/RIOT-OS/RIOT/commit/c9d7863e5664a169035038628029bb07e090c5ff
    https://github.com/RIOT-OS/RIOT/pull/19678
    https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-r2pv-3jqc-vh7w

    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