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CVE-2021-22659

Estado: ModificadaAlta (8.6)—

Rockwell Automation MicroLogix 1400 Version 21.6 and below may allow a remote unauthenticated attacker to send a specially crafted Modbus packet allowing the attacker to retrieve or modify random values in the register. If successfully exploited, this may lead to a buffer overflow resulting in a denial-of-service condition. The FAULT LED will flash RED and communications may be lost. Recovery from denial-of-service condition requires the fault to be cleared by the user.

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).

Tecnologías afectadas (1)

Rockwellautomation — Micrologix 1400 Firmware

CWE

Referencias

JSON original (NVD)

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          "role": "CISA Coordinator",
          "options": [
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              "automatable": "yes"
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              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-06-03T13:09:27.807640Z"
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          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
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          "accessComplexity": "LOW",
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          "confidentialityImpact": "PARTIAL"
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        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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    "cvssMetricV31": [
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        "cvssData": {
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  "affected": [
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  "published": "2021-03-25T16:15:14.040",
  "references": [
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      "url": "https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1129877/loc/en_US#__highlight",
      "tags": [
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    {
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      "tags": [
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  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "ics-cert@hq.dhs.gov",
      "description": [
        {
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          "value": "CWE-120"
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  "descriptions": [
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      "lang": "en",
      "value": "Rockwell Automation MicroLogix 1400 Version 21.6 and below may allow a remote unauthenticated attacker to send a specially crafted Modbus packet allowing the attacker to retrieve or modify random values in the register. If successfully exploited, this may lead to a buffer overflow resulting in a denial-of-service condition. The FAULT LED will flash RED and communications may be lost. Recovery from denial-of-service condition requires the fault to be cleared by the user."
    },
    {
      "lang": "es",
      "value": "Rockwell Automation MicroLogix 1400 versión 21.6 y anteriores, puede permitir a un atacante remoto no autenticado enviar un paquete Modbus especialmente diseñado que le permita al atacante recuperar o modificar valores aleatorios en el registro. Si es explotado con éxito, esto puede conllevar a un desbordamiento del búfer que resulte en una condición de denegación de servicio. El LED de FALLO parpadeará en ROJO y es posible que se pierdan las comunicaciones. Una recuperación de la condición de denegación de servicio requiere que el fallo sea eliminado por usuario"
    }
  ],
  "lastModified": "2026-06-17T03:37:31.840",
  "configurations": [
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