FKIE_CVE-2025-66624

Vulnerability from fkie_nvd - Published: 2025-12-05 19:15 - Updated: 2025-12-08 18:26
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
security-advisories@github.comhttps://github.com/bacnet-stack/bacnet-stack/commit/9378f7d1e70169ebde4a5090bae7603703eadf48
security-advisories@github.comhttps://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-8wgw-5h6x-qgqg
Impacted products
Vendor Product Version
To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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."
    },
    {
      "lang": "es",
      "value": "La biblioteca de la pila de protocolos BACnet proporciona servicios de comunicaci\u00f3n de capa de aplicaci\u00f3n BACnet, capa de red y capa de acceso al medio (MAC). Versiones anteriores a 1.5.0.rc2, la funci\u00f3n 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 peque\u00f1as pasan la verificaci\u00f3n de versi\u00f3n y luego se leen fuera de los l\u00edmites. 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."
    }
  ],
  "id": "CVE-2025-66624",
  "lastModified": "2025-12-08T18:26:49.133",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-12-05T19:15:53.120",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bacnet-stack/bacnet-stack/commit/9378f7d1e70169ebde4a5090bae7603703eadf48"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-8wgw-5h6x-qgqg"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}


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