CVE-2025-6523

Estado: ModificadaCrítica (9.5)—

Use of weak credentials in emergency authentication component in Devolutions Server allows an unauthenticated attacker to bypass authentication via brute forcing the short emergency codes generated by the server within a feasible timeframe.

This issue affects the following versions :

Detalles técnicos trazas, registros y código del informe original

  *  Devolutions Server 2025.2.2.0 through 2025.2.3.0
  *  
Devolutions Server 2025.1.11.0 and earlier

CVSS

Versión: 4.0
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Puntuación base: 9.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.42%
Percentil entre todas las CVEs puntuadas: 34
Fecha de la puntuación: 5/10/2026

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.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access85 %
Impacto principalT1078.001 Default Accountsstealth · persistence · privilege escalation · initial access90 %
Impacto secundarioT1556 Modify Authentication Processdefense impairment · persistence · credential access75 %

Acceso remoto sin autenticación mediante fuerza bruta de códigos de emergencia débiles en componente de autenticación de Devolutions Server. Impacto: obtención de credenciales válidas y control de cuentas administrativas.

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 Management Password Policies Multi-factor Authentication Vulnerability Scanning User Account Management Restrict File and Directory Permissions

Tecnologías afectadas (1)

Devolutions — Devolutions Server

CWE

CWE-1391

Referencias

https://devolutions.net/security/advisories/DEVO-2025-0012/

JSON original (NVD)

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      "value": "Use of weak credentials in emergency authentication component in Devolutions Server allows an unauthenticated attacker to bypass authentication via brute forcing the short emergency codes generated by the server within a feasible timeframe.\n\nThis issue affects the following versions :\n\n  *  Devolutions Server 2025.2.2.0 through 2025.2.3.0\n  *  \nDevolutions Server 2025.1.11.0 and earlier"
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    }
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  "lastModified": "2026-06-17T10:02:04.377",
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