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CVE-2025-66624

Estado: AnalizadaAlta (7.5)—

BACnet Protocol Stack library provides a BACnet application layer, network layer and media access (MAC) layer communications services. Prior to 1.5.0.rc2, The npdu_is_expected_reply function in src/bacnet/npdu.c indexes request_pdu[offset+2/3/5] and reply_pdu[offset+1/2/4] without verifying that those APDU bytes exist. bacnet_npdu_decode() can return offset == 2 for a 2-byte NPDU, so tiny PDUs pass the version check and then get read out of bounds. On ASan/MPU/strict builds this is an immediate crash (DoS). On unprotected builds it is undefined behavior and can mis-route replies; RCE is unlikely because only reads occur, but DoS is reliable.

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).

🎯 Técnicas ATT&CK

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

Vulnerabilidad de lectura fuera de límites (CWE-125) en BACnet Stack expuesto en red sin autenticación (AV:N/PR:N). Causa DoS por crash inmediato en compilaciones protegidas; acceso remoto a servicio en red sin privilegios = T1190. Impacto confirmado: denegación de servicio por crash de la aplicació

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 TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Tecnologías afectadas (1)

Bacnetstack — Bacnet Stack

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2025-66624",
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          "integrityImpact": "NONE",
          "userInteraction": "NONE",
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      "value": "BACnet Protocol Stack library provides a BACnet application layer, network layer and media access (MAC) layer communications services. Prior to 1.5.0.rc2, The npdu_is_expected_reply function in src/bacnet/npdu.c indexes request_pdu[offset+2/3/5] and reply_pdu[offset+1/2/4] without verifying that those APDU bytes exist. bacnet_npdu_decode() can return offset == 2 for a 2-byte NPDU, so tiny PDUs pass the version check and then get read out of bounds. On ASan/MPU/strict builds this is an immediate crash (DoS). On unprotected builds it is undefined behavior and can mis-route replies; RCE is unlikely because only reads occur, but DoS is reliable."
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      "value": "La biblioteca de la pila de protocolos BACnet proporciona servicios de comunicación de capa de aplicación BACnet, capa de red y capa de acceso al medio (MAC). Versiones anteriores a 1.5.0.rc2, la función npdu_is_expected_reply en src/bacnet/npdu.c indexa request_pdu[offset+2/3/5] y reply_pdu[offset+1/2/4] sin verificar que esos bytes APDU existan. bacnet_npdu_decode() puede devolver offset == 2 para una NPDU de 2 bytes, por lo que las PDU pequeñas pasan la verificación de versión y luego se leen fuera de los límites. En compilaciones ASan/MPU/estrictas, esto es un fallo inmediato (DoS). En compilaciones desprotegidas, es un comportamiento indefinido y puede enrutar mal las respuestas; RCE es poco probable porque solo ocurren lecturas, pero DoS es fiable."
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  "lastModified": "2026-06-17T09:57:07.407",
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