FKIE_CVE-2026-20056
Vulnerability from fkie_nvd - Published: 2026-02-04 17:16 - Updated: 2026-06-17 10:16
Severity
Summary
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.
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.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unknown",
"product": "Cisco Secure Web Appliance",
"vendor": "Cisco",
"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"
}
]
}
],
"source": "psirt@cisco.com"
}
],
"cveTags": [],
"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.\u0026nbsp;"
},
{
"lang": "es",
"value": "Una vulnerabilidad en la implementaci\u00f3n del motor Dynamic Vectoring and Streaming (DVS) de Cisco AsyncOS Software para Cisco Secure Web Appliance podr\u00eda permitir a un atacante remoto no autenticado eludir el esc\u00e1ner anti-malware, permitiendo la descarga de archivos comprimidos maliciosos.\n\nEsta vulnerabilidad se debe a un manejo inadecuado de ciertos archivos comprimidos. Un atacante podr\u00eda explotar esta vulnerabilidad enviando un archivo comprimido manipulado, que deber\u00eda ser bloqueado, a trav\u00e9s de un dispositivo afectado. Un exploit exitoso podr\u00eda permitir al atacante eludir el esc\u00e1ner anti-malware y descargar malware en una estaci\u00f3n de trabajo de usuario final. El malware descargado no se ejecutar\u00e1 autom\u00e1ticamente a menos que el usuario final extraiga y ejecute el archivo malicioso."
}
],
"id": "CVE-2026-20056",
"lastModified": "2026-06-17T10:16:59.583",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.0,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.2,
"impactScore": 1.4,
"source": "psirt@cisco.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-20056",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-02-04T16:40:05.362057Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-02-04T17:16:13.927",
"references": [
{
"source": "psirt@cisco.com",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wsa-archive-bypass-Scx2e8zF"
}
],
"sourceIdentifier": "psirt@cisco.com",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-494"
}
],
"source": "psirt@cisco.com",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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