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CVE-2021-35533

Status: ModifiedHigh (7.5)—

Improper Input Validation vulnerability in the APDU parser in the Bidirectional Communication Interface (BCI) IEC 60870-5-104 function of Hitachi Energy RTU500 series allows an attacker to cause the receiving RTU500 CMU of which the BCI is enabled to reboot when receiving a specially crafted message. By default, BCI IEC 60870-5-104 function is disabled (not configured). This issue affects: Hitachi Energy RTU500 series CMU Firmware version 12.0.* (all versions); CMU Firmware version 12.2.* (all versions); CMU Firmware version 12.4.* (all versions).

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Hitachienergy — Rtu500 Firmware

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-35533",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 7.1,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:C",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 6.9,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
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        "type": "Secondary",
        "source": "cybersecurity@hitachienergy.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
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        "exploitabilityScore": 3.9
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        "source": "nvd@nist.gov",
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  "affected": [
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      "source": "cybersecurity@hitachienergy.com",
      "affectedData": [
        {
          "vendor": "Hitachi Energy",
          "product": "RTU500 series",
          "versions": [
            {
              "status": "affected",
              "version": "CMU Firmware version 12.0",
              "versionType": "custom",
              "lessThanOrEqual": "12.0.*"
            },
            {
              "status": "affected",
              "version": "CMU Firmware version 12.2",
              "versionType": "custom",
              "lessThanOrEqual": "12.2.*"
            },
            {
              "status": "affected",
              "version": "CMU Firmware version 12.4",
              "versionType": "custom",
              "lessThanOrEqual": "12.4.*"
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  ],
  "published": "2021-11-26T17:15:07.743",
  "references": [
    {
      "url": "https://search.abb.com/library/Download.aspx?DocumentID=8DBD000063&LanguageCode=en&DocumentPartId=&Action=Launch",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "cybersecurity@hitachienergy.com"
    },
    {
      "url": "https://search.abb.com/library/Download.aspx?DocumentID=8DBD000063&LanguageCode=en&DocumentPartId=&Action=Launch",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "cybersecurity@hitachienergy.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
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    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
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    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Improper Input Validation vulnerability in the APDU parser in the Bidirectional Communication Interface (BCI) IEC 60870-5-104 function of Hitachi Energy RTU500 series allows an attacker to cause the receiving RTU500 CMU of which the BCI is enabled to reboot when receiving a specially crafted message. By default, BCI IEC 60870-5-104 function is disabled (not configured). This issue affects: Hitachi Energy RTU500 series CMU Firmware version 12.0.* (all versions); CMU Firmware version 12.2.* (all versions); CMU Firmware version 12.4.* (all versions)."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de comprobación de entrada inapropiada en el analizador de APDU en la función IEC 60870-5-104 de la interfaz de comunicación bidireccional (BCI) de la serie RTU500 de Hitachi Energy permite a un atacante causar el reinicio de la CMU RTU500 receptora en la que está habilitado el BCI cuando recibe un mensaje especialmente diseñado. Por defecto, la función BCI IEC 60870-5-104 está deshabilitada (no configurada). Este problema afecta a: Firmware de la CMU de la serie Hitachi Energy RTU500, versión 12.0.* (todas las versiones); Firmware de la CMU, versión 12.2.* (todas las versiones); Firmware de la CMU, versión 12.4.* (todas las versiones)"
    }
  ],
  "lastModified": "2026-06-17T03:57:39.317",
  "configurations": [
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  "sourceIdentifier": "cybersecurity@hitachienergy.com"
}