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CVE-2020-5665

Status: ModifiedHigh (7.4)—

Improper check or handling of exceptional conditions in MELSEC iQ-F series FX5U(C) CPU unit firmware version 1.060 and earlier allows an attacker to cause a denial-of-service (DoS) condition on program execution and communication by sending a specially crafted ARP packet.

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)

Mitsubishielectric — Melsec Iq-f Fx5u CPU Firmware

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2020-5665",
  "cveTags": [],
  "metrics": {
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          "baseScore": 3.3,
          "accessVector": "ADJACENT_NETWORK",
          "vectorString": "AV:A/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 6.5,
        "obtainUserPrivilege": false,
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        "userInteractionRequired": false
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    "cvssMetricV31": [
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          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
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          "userInteraction": "NONE",
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  "affected": [
    {
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      "affectedData": [
        {
          "vendor": "Mitsubishi Electric Corporation",
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          "versions": [
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  "published": "2020-12-14T03:15:13.653",
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Improper check or handling of exceptional conditions in MELSEC iQ-F series FX5U(C) CPU unit firmware version 1.060 and earlier allows an attacker to cause a denial-of-service (DoS) condition on program execution and communication by sending a specially crafted ARP packet."
    },
    {
      "lang": "es",
      "value": "Una comprobación o manejo inapropiado de condiciones excepcionales en la unidad CPU FX5U(C) de MELSEC iQ-F series versión 1.060 y anterior, permite a un atacante causar una condición de denegación de servicio (DoS) en una ejecución del programa y la comunicación mediante el envío de un paquete ARP especialmente diseñado."
    }
  ],
  "lastModified": "2026-06-17T03:22:03.757",
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}