CVE-2025-24356

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Even a 1-byte UDP packet just containing the fastd packet type header can trigger a much larger handshake packet (~150 bytes of UDP payload). Including IPv4 and UDP headers, the resulting amplification factor is roughly 12-13. By sending data packets with a spoofed source address to fastd instances reachable on the internet, this amplification of UDP traffic might be used to facilitate a Distributed Denial of Service attack. This vulnerability is fixed in v23."}, {"lang": "es", "value": "fastd es una VPN daemon que tuneliza paquetes IP y tramas Ethernet sobre UDP. Al recibir un paquete de datos de una combinaci\u00f3n desconocida de direcci\u00f3n IP/puerto, fastd asumir\u00e1 que uno de sus pares conectados se ha mudado a una nueva direcci\u00f3n e iniciar\u00e1 una reconexi\u00f3n enviando un paquete handshake. Esta \"reconexi\u00f3n r\u00e1pida\" evita tener que esperar a que se agote el tiempo de espera de la sesi\u00f3n (hasta ~90 s) hasta que se establezca una nueva conexi\u00f3n. Incluso un paquete UDP de 1 byte que solo contenga el encabezado de tipo de paquete fastd puede activar un paquete handshakee mucho m\u00e1s grande (~150 bytes de UDP payload). incluida IPv4 y encabezados UDP, el factor de amplificaci\u00f3n resultante es aproximadamente 12-13. Al enviar paquetes de datos con una direcci\u00f3n de origen falsificada a instancias de fastd accesibles en Internet, esta amplificaci\u00f3n del tr\u00e1fico UDP podr\u00eda usarse para facilitar un ataque de denegaci\u00f3n de servicio distribuido. Esta vulnerabilidad se corrigi\u00f3 en la v23."}], "id": "CVE-2025-24356", "lastModified": "2026-06-17T08:58:37.750", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L/E:X/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-24356", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-01-28T15:38:54.975943Z", "version": "2.0.3"}}]}, "published": "2025-01-27T18:15:41.347", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/neocturne/fastd/commit/1f233bee76b722c0b3f9024f2c39c72e9f7e5843"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/neocturne/fastd/commit/3940150e801d0c91460491bec32cbcc5bbc89d5f"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/neocturne/fastd/commit/5f63fcfc18ae9cad023fa463b152d5e14192b5a8"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/neocturne/fastd/commit/9df7e516378441d2d17b89f9db5c27c8312d8f12"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/neocturne/fastd/commit/c1a07b3f2b9066c3713c68547da700b85d60f4f7"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/neocturne/fastd/commit/ce1b79b12dbfa796743b5f3a50789ade965b7023"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/neocturne/fastd/commit/d03a0a17347efb5293e42fde7d982781e90f14ef"}, {"source": "security-advisories@github.com", "tags": ["Mitigation", "Patch", "Vendor Advisory"], "url": "https://github.com/neocturne/fastd/security/advisories/GHSA-pggg-vpfv-4rcv"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-405"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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