VDE-2021-049

Vulnerability from csaf_wagogmbhcokg - Published: 2021-11-16 12:05 - Updated: 2025-05-22 13:03
Summary
WAGO: Denial of Service Vulnerability in CODESYS Runtime 2.3
Notes
Summary: A Denial-of-Service Vulnerability was reported in CODESYS 2.3 Runtime. The CODESYS 2.3 Runtime is an essential component in several WAGO PLC's. All vulnerable PLCs are listed in chapter 'Affected Products'.
Impact: The reported vulnerabilities allow an attacker who has access to the device and is able to exploit the vulnerability, to manipulate and disrupt the CODESYS 2.3 Runtime of the device.
Mitigation: 1. Use general security best practices to protect systems from local and network attacks. 2. Do not allow direct access to the device from untrusted networks. 3. Update to the latest firmware according to the table in chapter solutions. 4. Disable the CODESYS 2.3 port 2455.
CVE-2021-34593
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-755 - Improper Handling of Exceptional Conditions
Mitigation 1. Use general security best practices to protect systems from local and network attacks. 2. Do not allow direct access to the device from untrusted networks. 3. Update to the latest firmware according to the table in chapter solutions. 4. Disable the CODESYS 2.3 port 2455.
Affected products
Product Identifier Version Remediation
Unresolved product id: CSAFPID-31001 —
Unresolved product id: CSAFPID-31002 —
Unresolved product id: CSAFPID-31003 —
Unresolved product id: CSAFPID-31004 —
Unresolved product id: CSAFPID-31005 —
Unresolved product id: CSAFPID-31006 —
Unresolved product id: CSAFPID-31007 —
Unresolved product id: CSAFPID-31008 —
Unresolved product id: CSAFPID-31009 —
Unresolved product id: CSAFPID-31010 —
Unresolved product id: CSAFPID-31011 —
Unresolved product id: CSAFPID-31012 —
Unresolved product id: CSAFPID-31013 —
Product Identifier Version Remediation
Unresolved product id: CSAFPID-32001 —
Unresolved product id: CSAFPID-32002 —
Unresolved product id: CSAFPID-32003 —
Unresolved product id: CSAFPID-32004 —
Unresolved product id: CSAFPID-32005 —
Unresolved product id: CSAFPID-32006 —
Unresolved product id: CSAFPID-32007 —
Unresolved product id: CSAFPID-32008 —
Unresolved product id: CSAFPID-32009 —
Unresolved product id: CSAFPID-32010 —
Unresolved product id: CSAFPID-32011 —
Unresolved product id: CSAFPID-32012 —
Unresolved product id: CSAFPID-32013 —
References
Acknowledgments
CERTVDE certvde.com
SEC Consult Vulnerability Lab. Steffen Robertz and Gerhard Hechenberger
To clipboard 

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    "acknowledgments": [
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        "organization": "CERTVDE",
        "summary": "coordination",
        "urls": [
          "https://certvde.com"
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      {
        "names": [
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        "organization": "SEC Consult Vulnerability Lab.",
        "summary": "reporting"
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    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
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    "notes": [
      {
        "category": "summary",
        "text": "A Denial-of-Service Vulnerability was reported in CODESYS 2.3 Runtime. The CODESYS 2.3 Runtime is an essential component in several WAGO PLC\u0027s. All vulnerable PLCs are listed in chapter \u0027Affected Products\u0027.",
        "title": "Summary"
      },
      {
        "category": "description",
        "text": "The reported vulnerabilities allow an attacker who has access to the device and is able to exploit the vulnerability, to manipulate and disrupt the CODESYS 2.3 Runtime of the device.",
        "title": "Impact"
      },
      {
        "category": "description",
        "text": "1. Use general security best practices to protect systems from local and network attacks. \n 2. Do not allow direct access to the device from untrusted networks. \n 3. Update to the latest firmware according to the table in chapter solutions. \n 4. Disable the CODESYS 2.3 port 2455. ",
        "title": "Mitigation"
      }
    ],
    "publisher": {
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      "contact_details": "psirt@wago.com",
      "name": "WAGO GmbH \u0026 Co. KG",
      "namespace": "https://www.wago.com/psirt"
    },
    "references": [
      {
        "category": "external",
        "summary": "CERT@VDE Security Advisories for WAGO",
        "url": "https://certvde.com/en/advisories/vendor/wago/"
      },
      {
        "category": "self",
        "summary": "VDE-2021-049: WAGO: Denial of Service Vulnerability in CODESYS Runtime 2.3 - HTML",
        "url": "https://certvde.com/de/advisories/VDE-2020-015/"
      },
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        "summary": "VDE-2021-049: WAGO: Denial of Service Vulnerability in CODESYS Runtime 2.3 - CSAF",
        "url": "https://wago.csaf-tp.certvde.com/.well-known/csaf/white/2021/vde-2021-049.json"
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    "title": "WAGO: Denial of Service Vulnerability in CODESYS Runtime 2.3",
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          "CSAFPID-31010",
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          "CSAFPID-32008",
          "CSAFPID-32009",
          "CSAFPID-32010",
          "CSAFPID-32011",
          "CSAFPID-32012",
          "CSAFPID-32013"
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      }
    ],
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      {
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        },
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        "relates_to_product_reference": "CSAFPID-11007"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware \u003c=FW19 installed on 750-8211/xxx-xxx",
          "product_id": "CSAFPID-31008"
        },
        "product_reference": "CSAFPID-21001",
        "relates_to_product_reference": "CSAFPID-11008"
      },
      {
        "category": "installed_on",
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          "product_id": "CSAFPID-32008"
        },
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        "relates_to_product_reference": "CSAFPID-11008"
      },
      {
        "category": "installed_on",
        "full_product_name": {
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          "product_id": "CSAFPID-31009"
        },
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        "relates_to_product_reference": "CSAFPID-11009"
      },
      {
        "category": "installed_on",
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          "product_id": "CSAFPID-32009"
        },
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        "relates_to_product_reference": "CSAFPID-11009"
      },
      {
        "category": "installed_on",
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          "name": "Firmware \u003c=FW19 installed on 750-8213/xxx-xxx",
          "product_id": "CSAFPID-31010"
        },
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        "relates_to_product_reference": "CSAFPID-11010"
      },
      {
        "category": "installed_on",
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      },
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          "product_id": "CSAFPID-31011"
        },
        "product_reference": "CSAFPID-21001",
        "relates_to_product_reference": "CSAFPID-11011"
      },
      {
        "category": "installed_on",
        "full_product_name": {
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          "product_id": "CSAFPID-32011"
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      },
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          "product_id": "CSAFPID-31012"
        },
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        "relates_to_product_reference": "CSAFPID-11012"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware FW20 installed on 750-8216/xxx-xxx",
          "product_id": "CSAFPID-32012"
        },
        "product_reference": "CSAFPID-22001",
        "relates_to_product_reference": "CSAFPID-11012"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware \u003c=FW19 installed on 750-8217/xxx-xxx",
          "product_id": "CSAFPID-31013"
        },
        "product_reference": "CSAFPID-21001",
        "relates_to_product_reference": "CSAFPID-11013"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware FW20 installed on 750-8217/xxx-xxx",
          "product_id": "CSAFPID-32013"
        },
        "product_reference": "CSAFPID-22001",
        "relates_to_product_reference": "CSAFPID-11013"
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    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-34593",
      "cwe": {
        "id": "CWE-755",
        "name": "Improper Handling of Exceptional Conditions"
      },
      "notes": [
        {
          "category": "summary",
          "text": "In CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56 unauthenticated crafted invalid requests may result in several denial-of-service conditions. Running PLC programs may be stopped, memory may be leaked, or further communication clients may be blocked from accessing the PLC."
        }
      ],
      "product_status": {
        "fixed": [
          "CSAFPID-32001",
          "CSAFPID-32002",
          "CSAFPID-32003",
          "CSAFPID-32004",
          "CSAFPID-32005",
          "CSAFPID-32006",
          "CSAFPID-32007",
          "CSAFPID-32008",
          "CSAFPID-32009",
          "CSAFPID-32010",
          "CSAFPID-32011",
          "CSAFPID-32012",
          "CSAFPID-32013"
        ],
        "known_affected": [
          "CSAFPID-31001",
          "CSAFPID-31002",
          "CSAFPID-31003",
          "CSAFPID-31004",
          "CSAFPID-31005",
          "CSAFPID-31006",
          "CSAFPID-31007",
          "CSAFPID-31008",
          "CSAFPID-31009",
          "CSAFPID-31010",
          "CSAFPID-31011",
          "CSAFPID-31012",
          "CSAFPID-31013"
        ]
      },
      "remediations": [
        {
          "category": "mitigation",
          "details": "1. Use general security best practices to protect systems from local and network attacks. \n 2. Do not allow direct access to the device from untrusted networks. \n 3. Update to the latest firmware according to the table in chapter solutions. \n 4. Disable the CODESYS 2.3 port 2455.",
          "group_ids": [
            "CSAFGID-0001"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "environmentalScore": 7.5,
            "environmentalSeverity": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "temporalScore": 7.5,
            "temporalSeverity": "HIGH",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-31001",
            "CSAFPID-31002",
            "CSAFPID-31003",
            "CSAFPID-31004",
            "CSAFPID-31005",
            "CSAFPID-31006",
            "CSAFPID-31007",
            "CSAFPID-31008",
            "CSAFPID-31009",
            "CSAFPID-31010",
            "CSAFPID-31011",
            "CSAFPID-31012",
            "CSAFPID-31013"
          ]
        }
      ],
      "title": "CVE-2021-34593"
    }
  ]
}


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Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.