CVE-2026-23533

Estado: ModificadaAlta (7.7)—

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, a client-side heap buffer overflow occurs in the RDPGFX ClearCodec decode path when maliciously crafted residual data causes out-of-bounds writes during color output. A malicious server can trigger a client‑side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code‑execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.

CVSS

Versión: 4.0
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/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: 7.7

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.52%
Percentil entre todas las CVEs puntuadas: 42
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.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access75 %
Impacto principalT1499.004 Application or System Exploitationimpact80 %
Impacto secundarioT1068 Exploitation for Privilege Escalationprivilege escalation65 %

Vector CVSS AV:N/PR:N/UI:N indica explotación remota sin privilegios (T1190). Servidor malicioso causa desbordamiento de búfer en cliente FreeRDP, resultando en DoS (T1499.004) y potencial corrupción de memoria con riesgo de ejecución remota (T1068).

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

Filter Network Traffic Application Isolation and Sandboxing Exploit Protection Update Software Vulnerability Scanning Threat Intelligence Program

Tecnologías afectadas (1)

Freerdp — Freerdp

CWE

CWE-122
CWE-122

Referencias

JSON original (NVD)

Mostrar

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  "published": "2026-01-19T18:16:05.170",
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  "vulnStatus": "Modified",
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      "lang": "en",
      "value": "FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, a client-side heap buffer overflow occurs in the RDPGFX ClearCodec decode path when maliciously crafted residual data causes out-of-bounds writes during color output. A malicious server can trigger a client‑side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code‑execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue."
    },
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      "lang": "es",
      "value": "FreeRDP es una implementación gratuita del Protocolo de Escritorio Remoto. Antes de la versión 3.21.0, se produce un desbordamiento de búfer de montón del lado del cliente en la ruta de decodificación RDPGFX ClearCodec cuando datos residuales creados maliciosamente causan escrituras fuera de límites durante la salida de color. Un servidor malicioso puede desencadenar un desbordamiento de búfer de montón del lado del cliente, causando un fallo (DoS) y una posible corrupción del montón con riesgo de ejecución de código dependiendo del comportamiento del asignador y del diseño del montón circundante. La versión 3.21.0 contiene un parche para el problema."
    }
  ],
  "lastModified": "2026-07-15T02:18:42.400",
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