CVE-2026-20043
Full vulnerability record from the local CVENow database.
Description
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20043 are related to issues concerning out-of-bounds writes that are grouped under the Common Weakness Enumeration (CWE) Base CWE-787.
Severity
CRITICAL
CVSS score
9.0
(v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-10-21 17:18:27.087000
Last modified
2026-10-26 10:10:00.140000
View original CVE JSON
{
"id": "CVE-2026-20043",
"sourceIdentifier": "[email protected]",
"published": "2026-10-21T17:18:27.087",
"lastModified": "2026-10-26T10:10:00.140",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.\r\n\r\nThe vulnerabilities tracked by CVE-2026-20043 are related to issues concerning out-of-bounds writes that are grouped under the Common Weakness Enumeration (CWE) Base CWE-787."
},
{
"lang": "es",
"value": "Como parte del compromiso continuo de Cisco con la seguridad proactiva y la calidad del producto, el equipo de ingeniería del software de código abierto Snort 3, propiedad de Cisco, ha llevado a cabo una revisión de seguridad interna exhaustiva. Esta revisión dio como resultado lanzamientos de fortalecimiento del software que abordan múltiples vulnerabilidades descubiertas internamente.\n\nLas vulnerabilidades rastreadas por CVE-2026-20043 están relacionadas con problemas de escrituras fuera de límites que se agrupan bajo la Enumeración de Vulnerabilidades Comunes (CWE) Base CWE-787."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "Cisco",
"product": "Cisco Cyber Vision",
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},
{
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},
{
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},
{
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},
{
"version": "17.9.5e",
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},
{
"version": "17.12.4a",
"status": "affected"
},
{
"version": "17.15.2c",
"status": "affected"
},
{
"version": "17.9.5f",
"status": "affected"
},
{
"version": "17.12.4b",
"status": "affected"
},
{
"version": "17.15.2a",
"status": "affected"
},
{
"version": "17.12.5",
"status": "affected"
},
{
"version": "17.17.1",
"status": "affected"
},
{
"version": "17.12.5a",
"status": "affected"
},
{
"version": "17.9.7a",
"status": "affected"
},
{
"version": "17.15.3a",
"status": "affected"
},
{
"version": "17.15.3",
"status": "affected"
},
{
"version": "17.12.5b",
"status": "affected"
},
{
"version": "17.12.5c",
"status": "affected"
},
{
"version": "17.15.4",
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},
{
"version": "17.9.7b",
"status": "affected"
},
{
"version": "17.18.1",
"status": "affected"
},
{
"version": "17.18.1a",
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},
{
"version": "17.12.6",
"status": "affected"
},
{
"version": "17.9.8",
"status": "affected"
},
{
"version": "17.15.4c",
"status": "affected"
},
{
"version": "17.12.5d",
"status": "affected"
},
{
"version": "17.18.2",
"status": "affected"
},
{
"version": "26.1.1",
"status": "affected"
},
{
"version": "17.15.5",
"status": "affected"
},
{
"version": "17.15.5a",
"status": "affected"
},
{
"version": "17.12.7",
"status": "affected"
},
{
"version": "17.12.7a",
"status": "affected"
},
{
"version": "17.12.7b",
"status": "affected"
},
{
"version": "17.9.9",
"status": "affected"
},
{
"version": "17.18.3a",
"status": "affected"
},
{
"version": "17.12.8",
"status": "affected"
},
{
"version": "17.15.6",
"status": "affected"
},
{
"version": "17.18.4",
"status": "affected"
},
{
"version": "26.1.2",
"status": "affected"
},
{
"version": "17.9.10",
"status": "affected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
"baseScore": 9.0,
"baseSeverity": "CRITICAL",
"attackVector": "NETWORK",
"attackComplexity": "HIGH",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "CHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 2.2,
"impactScore": 6.0
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-10-21T00:00:00+00:00",
"id": "CVE-2026-20043",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-787"
}
]
}
],
"references": [
{
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-snort3-ybgmhTQe",
"source": "[email protected]"
}
]
}