NULL Pointer Dereference Affecting riot-os/riot package, versions [,2025.10)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-UNMANAGED-RIOTOSRIOT-14468765
- published18 Dec 2025
- disclosed17 Dec 2025
- creditNils-Bernsdorf
Introduced: 17 Dec 2025
CVE-2025-66646 (opens in a new tab)How to fix?
Upgrade riot-os/riot to version 2025.10 or higher.
Overview
Affected versions of this package are vulnerable to NULL Pointer Dereference in the IPv6 fragmentation reassembly implementation - gnrc_ipv6_ext_frag_reass function, when processing a fragmented IPv6 packet with a fragment offset of 0 and an empty payload. An attacker can cause the operating system to crash by sending specially crafted IPv6 packets.
This is only exploitable if the gnrc_ipv6_ext_frag module is enabled and the attacker can send arbitrary IPv6 packets to the target device.