CVE-2025-66646

{"id": "CVE-2025-66646", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-66646", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2025-12-17T20:26:51.611506Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 1.7, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "LOW", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "UNREPORTED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "RIOT-OS", "product": "RIOT", "versions": [{"status": "affected", "version": "< 2025.10"}]}]}], "published": "2025-12-17T20:15:56.170", "references": [{"url": "https://github.com/RIOT-OS/RIOT/blob/eb65305cf9f1b7affb50b17af5c12341b83a8636/sys/net/gnrc/network_layer/ipv6/ext/frag/gnrc_ipv6_ext_frag.c#L411", "tags": ["Product"], "source": "security-advisories@github.com"}, {"url": "https://github.com/RIOT-OS/RIOT/blob/eb65305cf9f1b7affb50b17af5c12341b83a8636/sys/net/gnrc/network_layer/ipv6/ext/frag/gnrc_ipv6_ext_frag.c#L420", "tags": ["Product"], "source": "security-advisories@github.com"}, {"url": "https://github.com/RIOT-OS/RIOT/blob/eb65305cf9f1b7affb50b17af5c12341b83a8636/sys/net/gnrc/network_layer/ipv6/ext/frag/gnrc_ipv6_ext_frag.c#L490", "tags": ["Product"], "source": "security-advisories@github.com"}, {"url": "https://github.com/RIOT-OS/RIOT/blob/eb65305cf9f1b7affb50b17af5c12341b83a8636/sys/net/gnrc/network_layer/ipv6/ext/frag/gnrc_ipv6_ext_frag.c#L532", "tags": ["Product"], "source": "security-advisories@github.com"}, {"url": "https://github.com/RIOT-OS/RIOT/blob/eb65305cf9f1b7affb50b17af5c12341b83a8636/sys/net/gnrc/network_layer/ipv6/ext/frag/gnrc_ipv6_ext_frag.c#L534", "tags": ["Product"], "source": "security-advisories@github.com"}, {"url": "https://github.com/RIOT-OS/RIOT/blob/eb65305cf9f1b7affb50b17af5c12341b83a8636/sys/net/gnrc/network_layer/ipv6/ext/frag/gnrc_ipv6_ext_frag.c#L544", "tags": ["Product"], "source": "security-advisories@github.com"}, {"url": "https://github.com/RIOT-OS/RIOT/blob/eb65305cf9f1b7affb50b17af5c12341b83a8636/sys/net/gnrc/pktbuf_static/gnrc_pktbuf_static.c#L150C1-L150C76", "tags": ["Product"], "source": "security-advisories@github.com"}, {"url": "https://github.com/RIOT-OS/RIOT/releases/tag/2025.10", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-v8gx-q9m6-5xm9", "tags": ["Exploit", "Patch", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/user-attachments/files/23903992/reproducer_1.zip", "tags": ["Exploit"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-476"}]}], "descriptions": [{"lang": "en", "value": "RIOT is an open-source microcontroller operating system, designed to match the requirements of Internet of Things (IoT) devices and other embedded devices. A vulnerability was discovered in the IPv6 fragmentation reassembly implementation of RIOT OS v2025.07. When receiving an fragmented IPv6 packet with fragment offset 0 and an empty payload, the payload pointer is set to NULL. However, the implementation still tries to copy the payload into the reassembly buffer, resulting in a NULL pointer dereference which crashes the OS (DoS). To trigger the vulnerability, the `gnrc_ipv6_ext_frag` module must be enabled and the attacker must be able to send arbitrary IPv6 packets to the victim. RIOT OS v2025.10 fixes the issue."}, {"lang": "es", "value": "RIOT es un sistema operativo de microcontroladores de c\u00f3digo abierto, dise\u00f1ado para satisfacer los requisitos de los dispositivos de internet de las cosas (IoT) y otros dispositivos embebidos. Se descubri\u00f3 una vulnerabilidad en la implementaci\u00f3n de reensamblaje de fragmentaci\u00f3n IPv6 de RIOT OS v2025.07. Al recibir un paquete IPv6 fragmentado con un desplazamiento de fragmento de 0 y una carga \u00fatil vac\u00eda, el puntero de la carga \u00fatil se establece en NULL. Sin embargo, la implementaci\u00f3n a\u00fan intenta copiar la carga \u00fatil en el b\u00fafer de reensamblaje, lo que resulta en una desreferencia de puntero NULL que bloquea el sistema operativo (DoS). Para activar la vulnerabilidad, el m\u00f3dulo 'gnrc_ipv6_ext_frag' debe estar habilitado y el atacante debe poder enviar paquetes IPv6 arbitrarios a la v\u00edctima. RIOT OS v2025.10 corrige el problema."}], "lastModified": "2026-10-13T11:10:00.203", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:riot-os:riot:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3EE45C18-0705-45D6-9363-63017333DFF1", "versionEndExcluding": "2025.10"}, {"criteria": "cpe:2.3:o:riot-os:riot:2025.10:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6BEBF970-108C-4639-81A6-F2D307AC2959"}, {"criteria": "cpe:2.3:o:riot-os:riot:2025.10:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A234F893-E4EF-436D-8B1B-E7B94B353374"}, {"criteria": "cpe:2.3:o:riot-os:riot:2025.10:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "31354945-C4EE-4017-99D3-AEAE3D435A85"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}