FKIE_CVE-2026-20033
Vulnerability from fkie_nvd - Published: 2026-02-25 17:25 - Updated: 2026-06-17 10:16
Severity
Summary
A vulnerability in Cisco Nexus 9000 Series Fabric Switches in ACI mode could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to insufficient validation when processing specific Ethernet frames. An attacker could exploit this vulnerability by sending a crafted Ethernet frame to the management interface of an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition.
Note: Only the out-of-band (OOB) management interface is affected.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unknown",
"product": "Cisco NX-OS System Software in ACI Mode",
"vendor": "Cisco",
"versions": [
{
"status": "affected",
"version": "15.2(1g)"
},
{
"status": "affected",
"version": "15.2(2e)"
},
{
"status": "affected",
"version": "15.2(2f)"
},
{
"status": "affected",
"version": "15.2(2g)"
},
{
"status": "affected",
"version": "15.2(2h)"
},
{
"status": "affected",
"version": "15.2(3f)"
},
{
"status": "affected",
"version": "15.2(3e)"
},
{
"status": "affected",
"version": "15.2(3g)"
},
{
"status": "affected",
"version": "15.2(4d)"
},
{
"status": "affected",
"version": "15.2(4e)"
},
{
"status": "affected",
"version": "15.2(5c)"
},
{
"status": "affected",
"version": "15.2(5d)"
},
{
"status": "affected",
"version": "16.0(1g)"
},
{
"status": "affected",
"version": "15.2(5e)"
},
{
"status": "affected",
"version": "15.2(4f)"
},
{
"status": "affected",
"version": "15.2(6e)"
},
{
"status": "affected",
"version": "15.2(6h)"
},
{
"status": "affected",
"version": "16.0(1j)"
},
{
"status": "affected",
"version": "15.2(6g)"
},
{
"status": "affected",
"version": "15.2(7f)"
},
{
"status": "affected",
"version": "15.2(7g)"
},
{
"status": "affected",
"version": "16.0(2h)"
},
{
"status": "affected",
"version": "15.2(8d)"
},
{
"status": "affected",
"version": "16.0(2j)"
},
{
"status": "affected",
"version": "15.2(8e)"
},
{
"status": "affected",
"version": "16.0(3d)"
},
{
"status": "affected",
"version": "16.0(3e)"
},
{
"status": "affected",
"version": "15.2(8f)"
},
{
"status": "affected",
"version": "15.2(8g)"
},
{
"status": "affected",
"version": "15.3(1d)"
},
{
"status": "affected",
"version": "15.2(8h)"
},
{
"status": "affected",
"version": "16.0(4c)"
},
{
"status": "affected",
"version": "15.3(2a)"
},
{
"status": "affected",
"version": "15.2(8i)"
},
{
"status": "affected",
"version": "16.0(5h)"
},
{
"status": "affected",
"version": "15.3(2b)"
},
{
"status": "affected",
"version": "16.0(3g)"
},
{
"status": "affected",
"version": "16.0(5j)"
},
{
"status": "affected",
"version": "15.3(2c)"
},
{
"status": "affected",
"version": "16.0(6c)"
},
{
"status": "affected",
"version": "15.3(2d)"
},
{
"status": "affected",
"version": "16.1(1f)"
},
{
"status": "affected",
"version": "16.0(7e)"
},
{
"status": "affected",
"version": "16.0(8e)"
},
{
"status": "affected",
"version": "15.3(2e)"
},
{
"status": "affected",
"version": "16.0(8f)"
},
{
"status": "affected",
"version": "16.1(2f)"
},
{
"status": "affected",
"version": "16.1(2g)"
},
{
"status": "affected",
"version": "15.3(2f)"
},
{
"status": "affected",
"version": "16.0(9c)"
},
{
"status": "affected",
"version": "16.1(3f)"
},
{
"status": "affected",
"version": "16.0(9d)"
},
{
"status": "affected",
"version": "16.0(6h)"
},
{
"status": "affected",
"version": "16.0(8h)"
},
{
"status": "affected",
"version": "16.1(3g)"
},
{
"status": "affected",
"version": "16.0(9e)"
},
{
"status": "affected",
"version": "16.1(4h)"
}
]
}
],
"source": "psirt@cisco.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in Cisco Nexus 9000 Series Fabric Switches in ACI mode could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to insufficient validation when processing specific Ethernet frames. An attacker could exploit this vulnerability by sending a crafted Ethernet frame to the\u0026nbsp;management interface of an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition.\r\nNote: Only the out-of-band (OOB) management interface is affected."
},
{
"lang": "es",
"value": "Una vulnerabilidad en los switches de tejido Cisco Nexus serie 9000 en modo ACI podr\u00eda permitir a un atacante adyacente no autenticado causar una condici\u00f3n de denegaci\u00f3n de servicio (DoS) en un dispositivo afectado.\n\nEsta vulnerabilidad se debe a una validaci\u00f3n insuficiente al procesar tramas Ethernet espec\u00edficas. Un atacante podr\u00eda explotar esta vulnerabilidad al enviar una trama Ethernet manipulada a la interfaz de gesti\u00f3n de un dispositivo afectado. Un exploit exitoso podr\u00eda permitir al atacante hacer que el dispositivo se recargue inesperadamente, lo que resultar\u00eda en una condici\u00f3n de DoS.\nNota: Solo la interfaz de gesti\u00f3n fuera de banda (OOB) se ve afectada."
}
],
"id": "CVE-2026-20033",
"lastModified": "2026-06-17T10:16:56.763",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 4.0,
"source": "psirt@cisco.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-20033",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-02-25T18:18:01.739135Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-02-25T17:25:24.560",
"references": [
{
"source": "psirt@cisco.com",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-cpdos-qLsv6pFD"
}
],
"sourceIdentifier": "psirt@cisco.com",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-805"
}
],
"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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