Buffer Overflow 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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Test your applications- Snyk IDSNYK-UNMANAGED-RIOTOSRIOT-14468766
- published18 Dec 2025
- disclosed17 Dec 2025
- creditNils Bernsdorf
Introduced: 17 Dec 2025
CVE-2025-66647 (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 Buffer Overflow via the gnrc_ipv6_ext_frag_reass function. An attacker can corrupt memory and potentially execute arbitrary code by sending specially crafted IPv6 fragments that exploit the lack of size checks during reassembly.
This is only exploitable if the gnrc_ipv6_ext_frag module is included and the attacker can send arbitrary IPv6 packets to the target.