CVE-2026-20056
Estado: AplazadaMedia (4)—
A vulnerability in the Dynamic Vectoring and Streaming (DVS) Engine implementation of Cisco AsyncOS Software for Cisco Secure Web Appliance could allow an unauthenticated, remote attacker to bypass the anti-malware scanner, allowing malicious archive files to be downloaded.
Detalles técnicos trazas, registros y código del informe original
This vulnerability is due to improper handling of certain archive files. An attacker could exploit this vulnerability by sending a crafted archive file, which should be blocked, through an affected device. A successful exploit could allow the attacker to bypass the anti-malware scanner and download malware onto an end user workstation. The downloaded malware will not automatically execute unless the end user extracts and launches the malicious file.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
- Puntuación base: 4
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.16%
- Percentil entre todas las CVEs puntuadas: 5
- Fecha de la puntuación: 6/10/2026
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).
Tecnologías afectadas (2)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
CWE
- CWE-494
Referencias
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-20056",
"cveTags": [],
"metrics": {
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-20056",
"role": "CISA Coordinator",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2026-02-04T16:40:05.362057Z"
}
}
],
"cvssMetricV31": [
{
"type": "Secondary",
"source": "psirt@cisco.com",
"cvssData": {
"scope": "CHANGED",
"version": "3.1",
"baseScore": 4,
"attackVector": "NETWORK",
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N",
"integrityImpact": "LOW",
"userInteraction": "NONE",
"attackComplexity": "HIGH",
"availabilityImpact": "NONE",
"privilegesRequired": "NONE",
"confidentialityImpact": "NONE"
},
"impactScore": 1.4,
"exploitabilityScore": 2.2
}
]
},
"affected": [
{
"source": "psirt@cisco.com",
"affectedData": [
{
"vendor": "Cisco",
"product": "Cisco Secure Web Appliance",
"versions": [
{
"status": "affected",
"version": "11.8.0-453"
},
{
"status": "affected",
"version": "12.5.3-002"
},
{
"status": "affected",
"version": "12.0.3-007"
},
{
"status": "affected",
"version": "12.0.3-005"
},
{
"status": "affected",
"version": "14.1.0-032"
},
{
"status": "affected",
"version": "14.1.0-047"
},
{
"status": "affected",
"version": "14.1.0-041"
},
{
"status": "affected",
"version": "12.0.4-002"
},
{
"status": "affected",
"version": "14.0.2-012"
},
{
"status": "affected",
"version": "11.8.0-414"
},
{
"status": "affected",
"version": "12.0.1-268"
},
{
"status": "affected",
"version": "11.8.1-023"
},
{
"status": "affected",
"version": "11.8.3-021"
},
{
"status": "affected",
"version": "11.8.3-018"
},
{
"status": "affected",
"version": "12.5.1-011"
},
{
"status": "affected",
"version": "11.8.4-004"
},
{
"status": "affected",
"version": "12.5.2-007"
},
{
"status": "affected",
"version": "12.5.2-011"
},
{
"status": "affected",
"version": "14.5.0-498"
},
{
"status": "affected",
"version": "12.5.4-005"
},
{
"status": "affected",
"version": "12.5.4-011"
},
{
"status": "affected",
"version": "12.0.5-011"
},
{
"status": "affected",
"version": "14.0.3-014"
},
{
"status": "affected",
"version": "12.5.5-004"
},
{
"status": "affected",
"version": "12.5.5-005"
},
{
"status": "affected",
"version": "12.5.5-008"
},
{
"status": "affected",
"version": "14.0.4-005"
},
{
"status": "affected",
"version": "14.5.1-008"
},
{
"status": "affected",
"version": "14.5.1-016"
},
{
"status": "affected",
"version": "15.0.0-355"
},
{
"status": "affected",
"version": "15.0.0-322"
},
{
"status": "affected",
"version": "12.5.6-008"
},
{
"status": "affected",
"version": "15.1.0-287"
},
{
"status": "affected",
"version": "14.5.2-011"
},
{
"status": "affected",
"version": "15.2.0-116"
},
{
"status": "affected",
"version": "14.0.5-007"
},
{
"status": "affected",
"version": "15.2.0-164"
},
{
"status": "affected",
"version": "14.5.1-510"
},
{
"status": "affected",
"version": "12.0.2-012"
},
{
"status": "affected",
"version": "12.0.2-004"
},
{
"status": "affected",
"version": "14.5.1-607"
},
{
"status": "affected",
"version": "14.5.3-033"
},
{
"status": "affected",
"version": "15.0.1-004"
},
{
"status": "affected",
"version": "15.2.1-011"
},
{
"status": "affected",
"version": "14.5.0-673"
},
{
"status": "affected",
"version": "14.5.0-537"
},
{
"status": "affected",
"version": "12.0.1-334"
},
{
"status": "affected",
"version": "14.0.1-503"
},
{
"status": "affected",
"version": "14.0.1-053"
},
{
"status": "affected",
"version": "11.8.0-429"
},
{
"status": "affected",
"version": "14.0.1-040"
},
{
"status": "affected",
"version": "14.0.1-014"
},
{
"status": "affected",
"version": "12.5.1-043"
},
{
"status": "affected",
"version": "15.2.2-009"
},
{
"status": "affected",
"version": "15.5.0-566"
},
{
"status": "affected",
"version": "15.2.3-007"
},
{
"status": "affected",
"version": "15.5.0-574"
},
{
"status": "affected",
"version": "15.5.0-710"
},
{
"status": "affected",
"version": "15.2.4-022"
},
{
"status": "affected",
"version": "15.5.1-002"
}
],
"defaultStatus": "unknown"
}
]
}
],
"published": "2026-02-04T17:16:13.927",
"references": [
{
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wsa-archive-bypass-Scx2e8zF",
"source": "psirt@cisco.com"
}
],
"vulnStatus": "Deferred",
"weaknesses": [
{
"type": "Secondary",
"source": "psirt@cisco.com",
"description": [
{
"lang": "en",
"value": "CWE-494"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the Dynamic Vectoring and Streaming (DVS) Engine implementation of Cisco AsyncOS Software for Cisco Secure Web Appliance could allow an unauthenticated, remote attacker to bypass the anti-malware scanner, allowing malicious archive files to be downloaded.\r\n\r\nThis vulnerability is due to improper handling of certain archive files. An attacker could exploit this vulnerability by sending a crafted archive file, which should be blocked, through an affected device. A successful exploit could allow the attacker to bypass the anti-malware scanner and download malware onto an end user workstation. The downloaded malware will not automatically execute unless the end user extracts and launches the malicious file. "
},
{
"lang": "es",
"value": "Una vulnerabilidad en la implementación del motor Dynamic Vectoring and Streaming (DVS) de Cisco AsyncOS Software para Cisco Secure Web Appliance podría permitir a un atacante remoto no autenticado eludir el escáner anti-malware, permitiendo la descarga de archivos comprimidos maliciosos.\n\nEsta vulnerabilidad se debe a un manejo inadecuado de ciertos archivos comprimidos. Un atacante podría explotar esta vulnerabilidad enviando un archivo comprimido manipulado, que debería ser bloqueado, a través de un dispositivo afectado. Un exploit exitoso podría permitir al atacante eludir el escáner anti-malware y descargar malware en una estación de trabajo de usuario final. El malware descargado no se ejecutará automáticamente a menos que el usuario final extraiga y ejecute el archivo malicioso."
}
],
"lastModified": "2026-06-17T10:16:59.583",
"sourceIdentifier": "psirt@cisco.com"
}