CVE-2026-20293
Estado: Pendiente de análisisAlta (7.1)—
A vulnerability in the Unified Extensible Firmware Interface (UEFI) Shell implementation of Cisco UCS Servers and UCS-based appliances could allow an authenticated attacker with valid credentials for a user account with the role of user or admin or an unauthenticated attacker with physical access to an affected device to bypass UEFI Secure Boot validation checks and execute unauthorized software.
This vulnerability is due to the availability of memory write commands in the UEFI Shell while UEFI Secure Boot is enabled on a device.
Leer descripción completaMostrar menos
An attacker could exploit this vulnerability by selecting the UEFI Shell boot option at boot time and using available shell commands to modify UEFI memory variables. A successful exploit could allow the attacker to manipulate the preboot environment, overwrite UEFI Secure Boot-related memory values, and execute unauthorized software on the affected device.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Puntuación base: 7.1
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.16%
- Percentil entre todas las CVEs puntuadas: 4
- 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).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation85 % - Impacto principal
T1059Command and Scripting Interpreterexecution80 % - Impacto secundario
T1565.001Stored Data Manipulationimpact75 %
AV:L con PR:L permite acceso local autenticado para escalar privilegios en firmware UEFI. Permite ejecución de código no autorizado y manipulación de variables de memoria.
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 (2)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
CWE
- CWE-749
Referencias
JSON original (NVD)
Mostrar
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"status": "affected",
"version": "4.3(1.230138)"
},
{
"status": "affected",
"version": "4.2(3g)"
},
{
"status": "affected",
"version": "4.3(2.230207)"
},
{
"status": "affected",
"version": "4.2(3h)"
},
{
"status": "affected",
"version": "4.2(3i)"
},
{
"status": "affected",
"version": "4.3(2.230270)"
},
{
"status": "affected",
"version": "4.1(3m)"
},
{
"status": "affected",
"version": "4.1(2m)"
},
{
"status": "affected",
"version": "4.3(2.240002)"
},
{
"status": "affected",
"version": "4.3(3.240022)"
},
{
"status": "affected",
"version": "4.2(3j)"
},
{
"status": "affected",
"version": "4.1(3n)"
},
{
"status": "affected",
"version": "4.3(2.240009)"
},
{
"status": "affected",
"version": "4.3(3.240041)"
},
{
"status": "affected",
"version": "4.2(3k)"
},
{
"status": "affected",
"version": "4.3(3.240043)"
},
{
"status": "affected",
"version": "4.3(4.240142)"
},
{
"status": "affected",
"version": "4.3(2.240037)"
},
{
"status": "affected",
"version": "4.3(2.240053)"
},
{
"status": "affected",
"version": "4.3(4.240152)"
},
{
"status": "affected",
"version": "4.2(3l)"
},
{
"status": "affected",
"version": "4.3(2.240077)"
},
{
"status": "affected",
"version": "4.3(4.242028)"
},
{
"status": "affected",
"version": "4.3(4.241063)"
},
{
"status": "affected",
"version": "4.3(4.242038)"
},
{
"status": "affected",
"version": "4.2(3m)"
},
{
"status": "affected",
"version": "4.3(2.240090)"
},
{
"status": "affected",
"version": "4.3(5.240021)"
},
{
"status": "affected",
"version": "4.3(2.240107)"
},
{
"status": "affected",
"version": "4.3(4.242066)"
},
{
"status": "affected",
"version": "4.2(3n)"
},
{
"status": "affected",
"version": "4.3(5.250001)"
},
{
"status": "affected",
"version": "4.2(3o)"
},
{
"status": "affected",
"version": "4.3(2.250016)"
},
{
"status": "affected",
"version": "4.3(2.250021)"
},
{
"status": "affected",
"version": "4.3(5.250030)"
},
{
"status": "affected",
"version": "4.3(2.250022)"
},
{
"status": "affected",
"version": "4.3(6.250039)"
},
{
"status": "affected",
"version": "4.3(6.250040)"
},
{
"status": "affected",
"version": "4.3(5.250033)"
},
{
"status": "affected",
"version": "4.3(6.250044)"
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{
"status": "affected",
"version": "4.3(6.250053)"
},
{
"status": "affected",
"version": "4.3(2.250037)"
},
{
"status": "affected",
"version": "4.3(2.250045)"
},
{
"status": "affected",
"version": "4.3(4.252001)"
},
{
"status": "affected",
"version": "4.3(4.252002)"
},
{
"status": "affected",
"version": "6.0(1.250127)"
},
{
"status": "affected",
"version": "4.2(3p)"
},
{
"status": "affected",
"version": "6.0(1.250131)"
},
{
"status": "affected",
"version": "4.3(6.250101)"
},
{
"status": "affected",
"version": "6.0(1.250174)"
},
{
"status": "affected",
"version": "4.3(6.250117)"
},
{
"status": "affected",
"version": "4.3(5.250043)"
},
{
"status": "affected",
"version": "4.3(5.250045)"
},
{
"status": "affected",
"version": "4.3(6.250060)"
},
{
"status": "affected",
"version": "6.0(1.250130)"
},
{
"status": "affected",
"version": "4.3(4.241014)"
},
{
"status": "affected",
"version": "6.0(1.251030)"
},
{
"status": "affected",
"version": "4.3(2.250063)"
},
{
"status": "affected",
"version": "6.0(1.250192)"
},
{
"status": "affected",
"version": "4.3(6.260003)"
},
{
"status": "affected",
"version": "6.0(1.250194)"
},
{
"status": "affected",
"version": "6.0(1.260001)"
},
{
"status": "affected",
"version": "4.3(6.260017)"
},
{
"status": "affected",
"version": "4.3(2.260007)"
},
{
"status": "affected",
"version": "6.0(2.260044)"
},
{
"status": "affected",
"version": "6.0(2.260042)"
},
{
"status": "affected",
"version": "4.0(1.260003)"
},
{
"status": "affected",
"version": "2.0(2.260062)"
},
{
"status": "affected",
"version": "2.0(1.250127)"
},
{
"status": "affected",
"version": "2.0(1.250096)"
},
{
"status": "affected",
"version": "4.0(1.260004)"
},
{
"status": "affected",
"version": "6.0(2.260026)"
},
{
"status": "affected",
"version": "6.0(1.251006)"
},
{
"status": "affected",
"version": "1.2(0.250011)"
},
{
"status": "affected",
"version": "1.1(0.250016)"
},
{
"status": "affected",
"version": "1.0(0.240001)"
},
{
"status": "affected",
"version": "1.0(0.250003)"
},
{
"status": "affected",
"version": "1.2(0.250013)"
},
{
"status": "affected",
"version": "1.1(0.250026)"
},
{
"status": "affected",
"version": "1.0(1.250002)"
},
{
"status": "affected",
"version": "1.1(0.250022)"
},
{
"status": "affected",
"version": "1.1(0.250025)"
},
{
"status": "affected",
"version": "1.0(1.250032)"
},
{
"status": "affected",
"version": "6.0(2.260034)"
},
{
"status": "affected",
"version": "6.0(2.260069)"
},
{
"status": "affected",
"version": "4.3(6.260033)"
},
{
"status": "affected",
"version": "2.0(2.260101)"
},
{
"status": "affected",
"version": "4.2(3q)"
},
{
"status": "affected",
"version": "4.2(3r)"
},
{
"status": "affected",
"version": "1.2(0.260005)"
}
],
"defaultStatus": "unknown"
},
{
"vendor": "Cisco",
"product": "Cisco Unified Computing System E-Series Software (UCSE)",
"versions": [
{
"status": "affected",
"version": "4.11.1"
},
{
"status": "affected",
"version": "4.12.1"
},
{
"status": "affected",
"version": "4.12.2"
},
{
"status": "affected",
"version": "4.15.2"
},
{
"status": "affected",
"version": "4.15.3"
},
{
"status": "affected",
"version": "4.15.4"
}
],
"defaultStatus": "unknown"
}
]
}
],
"published": "2026-09-08T17:17:34.047",
"references": [
{
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucs-uefi-sb-bypass-eb6xC5GW",
"source": "psirt@cisco.com"
}
],
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"type": "Secondary",
"source": "psirt@cisco.com",
"description": [
{
"lang": "en",
"value": "CWE-749"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the Unified Extensible Firmware Interface (UEFI) Shell implementation of Cisco UCS Servers and UCS-based appliances could allow an authenticated attacker with valid credentials for a user account with the role of user or admin or an unauthenticated attacker with physical access to an affected device to bypass UEFI Secure Boot validation checks and execute unauthorized software.\r\n\r\nThis vulnerability is due to the availability of memory write commands in the UEFI Shell while UEFI Secure Boot is enabled on a device. An attacker could exploit this vulnerability by selecting the UEFI Shell boot option at boot time and using available shell commands to modify UEFI memory variables. A successful exploit could allow the attacker to manipulate the preboot environment, overwrite UEFI Secure Boot-related memory values, and execute unauthorized software on the affected device."
}
],
"lastModified": "2026-09-11T14:17:25.820",
"sourceIdentifier": "psirt@cisco.com"
}