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CVE-2021-27475

Status: ModifiedHigh (8.6)—

Rockwell Automation Connected Components Workbench v12.00.00 and prior does not limit the objects that can be deserialized. This vulnerability allows attackers to craft a malicious serialized object that, if opened by a local user in Connected Components Workbench, may result in remote code execution. This vulnerability requires user interaction to be successfully exploited.

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)

Rockwellautomation — Connected Components Workbench

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-27475",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2021-27475",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-04-16T17:30:43.735807Z"
        }
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    "cvssMetricV2": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 6.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "ics-cert@hq.dhs.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 8.6,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
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  "affected": [
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      "affectedData": [
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          "product": "Connected Components Workbench",
          "versions": [
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              "version": "unspecified",
              "versionType": "custom",
              "lessThanOrEqual": "v12.00.00"
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  ],
  "published": "2022-03-23T20:15:09.270",
  "references": [
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      "url": "https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1131435",
      "tags": [
        "Permissions Required",
        "Vendor Advisory"
      ],
      "source": "ics-cert@hq.dhs.gov"
    },
    {
      "url": "https://www.cisa.gov/uscert/ics/advisories/icsa-21-133-01",
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      "source": "ics-cert@hq.dhs.gov"
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    {
      "url": "https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1131435",
      "tags": [
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    {
      "url": "https://www.cisa.gov/uscert/ics/advisories/icsa-21-133-01",
      "tags": [
        "Third Party Advisory",
        "US Government Resource"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "ics-cert@hq.dhs.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-502"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-502"
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    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Rockwell Automation Connected Components Workbench v12.00.00 and prior does not limit the objects that can be deserialized. This vulnerability allows attackers to craft a malicious serialized object that, if opened by a local user in Connected Components Workbench, may result in remote code execution. This vulnerability requires user interaction to be successfully exploited."
    },
    {
      "lang": "es",
      "value": "Rockwell Automation Connected Components Workbench versiones v12.00.00 y anteriores, no limita los objetos que pueden ser deserializados. Esta vulnerabilidad permite a atacantes diseñar un objeto serializado malicioso que, si es abierto por un usuario local en Connected Components Workbench, puede resultar en una ejecución de código remota. Esta vulnerabilidad requiere la interacción del usuario para ser explotada con éxito"
    }
  ],
  "lastModified": "2026-06-17T03:44:56.360",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:rockwellautomation:connected_components_workbench:*:*:*:*:*:*:*:*",
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              "versionEndIncluding": "12.00.00"
            }
          ],
          "operator": "OR"
        }
      ]
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  ],
  "sourceIdentifier": "ics-cert@hq.dhs.gov"
}