What’s Vulnerable › Vulnerabilities

CVE-2023-24826: Usage of Uninitialized Timer during forwarding of Fragments with SFR

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-05-30 · updated 2026-06-17
• Weakness: CWE-824

Description

RIOT-OS, an operating system for Internet of Things (IoT) devices, contains a network stack with the ability to process 6LoWPAN frames. Prior to version 2023.04, an attacker can send crafted frames to the device to trigger the usage of an uninitialized object leading to denial of service. This issue is fixed in version 2023.04. As a workaround, disable fragment forwarding or SFR.

Affected products

• RIOT-OS RIOT: before 2023.04 — fixed in 2023.04

How to fix

Upgrade to a fixed version: RIOT-OS RIOT 2023.04. Check the vendor advisory for mitigations.

References

• https://github.com/RIOT-OS/RIOT/blob/ccbb304eae7b59e8aca24a6ffd095b5b3f7720ee/sys/net/gnrc/network_layer/sixlowpan/frag/sfr/gnrc_sixlowpan_frag_sfr.c#L402
• https://github.com/RIOT-OS/RIOT/blob/ccbb304eae7b59e8aca24a6ffd095b5b3f7720ee/sys/net/gnrc/network_layer/sixlowpan/frag/sfr/gnrc_sixlowpan_frag_sfr.c#L420
• https://github.com/RIOT-OS/RIOT/commit/287f030af20e829469cdf740606148018a5a220d
• https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-xfj4-9g7w-f4gh
• https://github.com/RIOT-OS/RIOT/blob/ccbb304eae7b59e8aca24a6ffd095b5b3f7720ee/sys/net/gnrc/network_layer/sixlowpan/frag/sfr/gnrc_sixlowpan_frag_sfr.c#L402
• https://github.com/RIOT-OS/RIOT/blob/ccbb304eae7b59e8aca24a6ffd095b5b3f7720ee/sys/net/gnrc/network_layer/sixlowpan/frag/sfr/gnrc_sixlowpan_frag_sfr.c#L420
• https://github.com/RIOT-OS/RIOT/commit/287f030af20e829469cdf740606148018a5a220d
• https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-xfj4-9g7w-f4gh

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