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CVE-2021-20613

Status: ModifiedHigh (7.5)—

Improper initialization vulnerability in MELSEC-F series FX3U-ENET Firmware version 1.16 and prior, FX3U-ENET-L Firmware version 1.16 and prior and FX3U-ENET-P502 Firmware version 1.16 and prior allows a remote unauthenticated attacker to cause a denial-of-service (DoS) condition in communication function of the product by sending specially crafted packets. Control by MELSEC-F series PLC is not affected by this vulnerability, but system reset is required for recovery.

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 (3)

Mitsubishielectric — Fx3u-enet-l FirmwareMitsubishielectric — Fx3u-enet-p502 FirmwareMitsubishielectric — Fx3u-enet Firmware

CWEs

References

Raw JSON (NVD)

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  "cveTags": [],
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          "baseScore": 7.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
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        "obtainAllPrivilege": false,
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
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  "affected": [
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      "source": "Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp",
      "affectedData": [
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          "product": "MELSEC-F series FX3U-ENET; MELSEC-F series FX3U-ENET-L; MELSEC-F series FX3U-ENET-P502",
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  "published": "2022-01-14T20:15:09.910",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
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          "value": "CWE-665"
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      "value": "Improper initialization vulnerability in MELSEC-F series FX3U-ENET Firmware version 1.16 and prior, FX3U-ENET-L Firmware version 1.16 and prior and FX3U-ENET-P502 Firmware version 1.16 and prior allows a remote unauthenticated attacker to cause a denial-of-service (DoS) condition in communication function of the product by sending specially crafted packets. Control by MELSEC-F series PLC is not affected by this vulnerability, but system reset is required for recovery."
    },
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      "lang": "es",
      "value": "Una vulnerabilidad de inicialización inapropiada en FX3U-ENET serie MELSEC-F, versiones de Firmware 1.16 y anteriores, FX3U-ENET-L versiones de Firmware 1.16 y anteriores, y FX3U-ENET-P502 versiones de Firmware 1.16 y anteriores, permite a un atacante remoto no autenticado causar una condición de denegación de servicio (DoS) en la función de comunicación del producto mediante el envío de paquetes especialmente diseñados. El control por parte del PLC de la serie MELSEC-F no está afectado por esta vulnerabilidad, pero es necesario reiniciar el sistema para recuperarlo"
    }
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  "lastModified": "2026-06-17T03:34:07.593",
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