CVE-2026-71941
Estado: AplazadaAlta (8.6)—
Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the diag_logmail function. The vulnerability is caused by concatenating multiple smtpReceiver email addresses into a fixed-size buffer without checking the remaining buffer size. A remote attacker can trigger this vulnerability via crafted input, causing a denial of service or potentially executing arbitrary commands. Exploitation requires valid administrative credentials for the device's web management interface.
CVSS
- Versión: 4.0
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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
- Puntuación base: 8.6
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.68%
- Percentil entre todas las CVEs puntuadas: 51
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1210Exploitation of Remote Serviceslateral movement85 % - Impacto principal
T1059Command and Scripting Interpreterexecution80 % - Impacto secundario
T1499.004Application or System Exploitationimpact75 %
Buffer overflow en función remota que requiere credenciales administrativas válidas (PR:H, AV:N). Permite ejecución arbitraria de comandos o denegación de servicio por desbordamiento de buffer en la concatenación de direcciones SMTP.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
CWE
- CWE-120
Referencias
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-71941",
"cveTags": [],
"metrics": {
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-71941",
"role": "CISA Coordinator",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"version": "2.0.3",
"timestamp": "2026-08-27T13:53:03.285168Z"
}
}
],
"cvssMetricV31": [
{
"type": "Secondary",
"source": "disclosure@vulncheck.com",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.2,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "HIGH",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 1.2
}
],
"cvssMetricV40": [
{
"type": "Secondary",
"source": "disclosure@vulncheck.com",
"cvssData": {
"Safety": "NOT_DEFINED",
"version": "4.0",
"Recovery": "NOT_DEFINED",
"baseScore": 8.6,
"Automatable": "NOT_DEFINED",
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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",
"exploitMaturity": "NOT_DEFINED",
"providerUrgency": "NOT_DEFINED",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"privilegesRequired": "HIGH",
"subIntegrityImpact": "NONE",
"vulnIntegrityImpact": "HIGH",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"vulnAvailabilityImpact": "HIGH",
"availabilityRequirement": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"subConfidentialityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"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": "disclosure@vulncheck.com",
"affectedData": [
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch G2540xs",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "3.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch P2540xs",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "3.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch FX2120",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "3.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch G2282x",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.10.6",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch P2282x",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.10.6",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch Q2300x",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.10.7",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch PQ2300xb",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.10.7",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch G2542x",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "3.10.6",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch P2542x",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "3.10.6",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch P2542xh",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "3.10.6",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch PX2060",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch G1280",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch P1280",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch P1281x",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch G1282",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch P1282",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch G2121",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch P2121",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch PQ2121x",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch Q2121x",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch G2280x",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch P2280x",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch Q2200x",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch PQ2200xb",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch G2100",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch P2100",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch G2540x",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "DrayTek Corporation",
"product": "VigorSwitch P2540x",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.9.10",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
}
]
}
],
"published": "2026-08-24T18:17:19.680",
"references": [
{
"url": "https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/",
"source": "disclosure@vulncheck.com"
},
{
"url": "https://www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-buffer-overflow-via-diag-logmail",
"source": "disclosure@vulncheck.com"
}
],
"vulnStatus": "Deferred",
"weaknesses": [
{
"type": "Secondary",
"source": "disclosure@vulncheck.com",
"description": [
{
"lang": "en",
"value": "CWE-120"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the diag_logmail function. The vulnerability is caused by concatenating multiple smtpReceiver email addresses into a fixed-size buffer without checking the remaining buffer size. A remote attacker can trigger this vulnerability via crafted input, causing a denial of service or potentially executing arbitrary commands. Exploitation requires valid administrative credentials for the device's web management interface."
}
],
"lastModified": "2026-08-27T17:19:49.757",
"sourceIdentifier": "disclosure@vulncheck.com"
}