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CVE-2021-4463

Estado: AplazadaAlta (8.7)—

Longjing Technology BEMS API versions up to and including 1.21 contains an unauthenticated arbitrary file download vulnerability in the 'downloads' endpoint. The 'fileName' parameter is not properly sanitized, allowing attackers to craft traversal sequences and access sensitive files outside the intended directory.

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.

Vector CVSS AV:N/PR:N/UI:N indica acceso remoto sin privilegios ni interacción. CWE-22 (path traversal) en endpoint unauthenticado expone lectura de archivos sensibles (T1005). Aplicación web expuesta.

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

Vulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkFilter Network TrafficApplication Isolation and Sandboxing

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Longjing Technology — Bems APIAI

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2021-4463",
  "cveTags": [],
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        "ssvcData": {
          "id": "CVE-2021-4463",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2025-11-13T17:05:01.698452Z"
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    "cvssMetricV40": [
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        "cvssData": {
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          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 8.7,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/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",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
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          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
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          "subConfidentialityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
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          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
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          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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  "affected": [
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      "affectedData": [
        {
          "vendor": "Shenzhen Longjing Technology Co. Ltd.",
          "product": "BEMS API",
          "versions": [
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              "status": "affected",
              "version": "0",
              "versionType": "custom",
              "lessThanOrEqual": "1.21"
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  "published": "2025-11-12T22:15:41.863",
  "references": [
    {
      "url": "https://cxsecurity.com/issue/WLB-2021070173",
      "source": "disclosure@vulncheck.com"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/206477",
      "source": "disclosure@vulncheck.com"
    },
    {
      "url": "https://packetstormsecurity.com/files/163702",
      "source": "disclosure@vulncheck.com"
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    {
      "url": "https://web.archive.org/web/20220527162453/http://www.ljkj2012.com/",
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      "url": "https://www.exploit-db.com/exploits/50163",
      "source": "disclosure@vulncheck.com"
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      "url": "https://www.vulncheck.com/advisories/longjing-technology-bems-api-remote-arbitrary-file-download",
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      "url": "https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5657.php",
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      "description": [
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          "value": "CWE-22"
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      "lang": "en",
      "value": "Longjing Technology BEMS API versions up to and including 1.21 contains an unauthenticated arbitrary file download vulnerability in the 'downloads' endpoint. The 'fileName' parameter is not properly sanitized, allowing attackers to craft traversal sequences and access sensitive files outside the intended directory."
    }
  ],
  "lastModified": "2026-06-17T04:19:48.733",
  "sourceIdentifier": "disclosure@vulncheck.com"
}