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CVE-2021-3156

Estado: AnalizadaAlta (7.8)⚠ Explotación activa

Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer overflow, which allows privilege escalation to root via "sudoedit -s" and a command-line argument that ends with a single backslash character.

CVSS

Probabilidad de explotación (EPSS)

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).

CISA KEV — explotada activamente

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad de buffer overflow en sudo explotable localmente con privilegios limitados (PR:L) permite escalada a root. El ataque requiere acceso local y usuario con permisos sudo limitados, típico de T1068. El resultado es ejecución de comandos como root (T1059) y escalada de privilegios (T1548.0

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

Privileged Account ManagementExecution PreventionThreat Intelligence ProgramRestrict Web-Based ContentRestrict File and Directory PermissionsOperating System Configuration

Tecnologías afectadas (24)

Beyondtrust — Privilege Management FOR MACBeyondtrust — Privilege Management FOR Unix/linuxDebian — Debian LinuxFedoraproject — FedoraMcafee — WEB GatewayNetapp — Active IQ Unified ManagerNetapp — Cloud BackupNetapp — HCI Management NodeNetapp — Oncommand Unified Manager Core PackageNetapp — Ontap Select Deploy Administration UtilityNetapp — Ontap ToolsNetapp — SolidfireOracle — Communications Performance Intelligence CenterOracle — Micros Compact Workstation 3 FirmwareOracle — Micros Es400 FirmwareOracle — Micros Kitchen Display System FirmwareOracle — Micros Workstation 5A FirmwareOracle — Micros Workstation 6 FirmwareOracle — Tekelec Platform DistributionSudo Project — SudoSynology — Diskstation ManagerSynology — Diskstation Manager Unified ControllerSynology — Skynas FirmwareSynology — Vs960hd Firmware

CWE

Referencias

JSON original (NVD)

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      "value": "Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer overflow, which allows privilege escalation to root via \"sudoedit -s\" and a command-line argument that ends with a single backslash character."
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  "lastModified": "2026-06-17T04:04:45.830",
  "cisaActionDue": "2022-04-27",
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  "cisaVulnerabilityName": "Sudo Heap-Based Buffer Overflow Vulnerability"
}