VDE-2021-022

Vulnerability from csaf_phoenixcontactgmbhcokg - Published: 2021-06-23 12:16 - Updated: 2025-05-14 12:28
Summary
PHOENIX CONTACT: Security Advisory for FL COMSERVER UNI
Notes
Summary: When the communication partner sends an invalid Modbus exception response to the FL COMSERVER UNI as a query, the Modbus communication stops, and the device will be unresponsive for some minutes before the functionality is fully restored (CWE-772).
Remediation: PHOENIX CONTACT recommends affected users to upgrade to the latest firmware version which is available for download. | **Product Number** | **Product Name** | **Firmware Version** | |--------------------|------------------------------------|-----------------------------| | 2313452 | FL COMSERVER UNI 232/422/485 | 2.41 | | 2904817 | FL COMSERVER UNI 232/422/485-T | 2.41 |
Impact: An attacker may use this vulnerability to execute a Denial of Service (DoS) attack.
CVE-2021-21002

In Phoenix Contact FL COMSERVER UNI in versions <2.40 a invalid Modbus exception response can lead to a temporary denial of service.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-772 - Missing Release of Resource after Effective Lifetime
Mitigation Phoenix Contact recommends operating network-capable devices in closed networks or protected with a suitable firewall. For detailed information on our recommendations for measures to protect network-capable devices, please refer to our application note: Measures to protect network-capable devices with Ethernet connection
Affected products
Product Identifier Version Remediation
Unresolved product id: CSAFPID-31001 —
Unresolved product id: CSAFPID-31002 —
Product Identifier Version Remediation
Unresolved product id: CSAFPID-32001 —
Unresolved product id: CSAFPID-32002 —
References
Acknowledgments
CERT@VDE certvde.com
Waertsilae PSIRT Petri Tuomio
To clipboard 

{
  "document": {
    "acknowledgments": [
      {
        "organization": "CERT@VDE",
        "summary": "coordination",
        "urls": [
          "https://certvde.com"
        ]
      },
      {
        "names": [
          "Petri Tuomio"
        ],
        "organization": "Waertsilae PSIRT",
        "summary": "discovered and reported"
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "summary",
        "text": "When the communication partner sends an invalid Modbus exception response to the FL COMSERVER UNI as a query, the Modbus communication stops, and the device will be unresponsive for some minutes before the functionality is fully restored (CWE-772).",
        "title": "Summary"
      },
      {
        "category": "description",
        "text": "PHOENIX CONTACT recommends affected users to upgrade to the latest firmware version which is available for download.\n| **Product Number** | **Product Name**                   | **Firmware Version**       |\n|--------------------|------------------------------------|-----------------------------|\n| 2313452           | FL COMSERVER UNI 232/422/485       | 2.41    |\n| 2904817           | FL COMSERVER UNI 232/422/485-T     | 2.41     |\n",
        "title": "Remediation"
      },
      {
        "category": "description",
        "text": "An attacker may use this vulnerability to execute a Denial of Service (DoS) attack.",
        "title": "Impact"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "psirt@phoenixcontact.com",
      "name": "Phoenix Contact GmbH \u0026 Co. KG",
      "namespace": "https://phoenixcontact.com/psirt"
    },
    "references": [
      {
        "category": "external",
        "summary": "PHOENIX CONTACT advisory overview at CERT@VDE",
        "url": "https://certvde.com/en/advisories/vendor/phoenixcontact/"
      },
      {
        "category": "self",
        "summary": "VDE-2021-022: PHOENIX CONTACT: Security Advisory for FL COMSERVER UNI - HTML",
        "url": "https://certvde.com/en/advisories/VDE-2021-022"
      },
      {
        "category": "self",
        "summary": "VDE-2021-022: PHOENIX CONTACT: Security Advisory for FL COMSERVER UNI - CSAF",
        "url": "https://phoenixcontact.csaf-tp.certvde.com/.well-known/csaf/white/2021/vde-2021-022.json"
      }
    ],
    "title": "PHOENIX CONTACT: Security Advisory for FL COMSERVER UNI",
    "tracking": {
      "aliases": [
        "VDE-2021-022"
      ],
      "current_release_date": "2025-05-14T12:28:19.000Z",
      "generator": {
        "date": "2025-02-10T08:35:43.259Z",
        "engine": {
          "name": "Secvisogram",
          "version": "2.5.18"
        }
      },
      "id": "VDE-2021-022",
      "initial_release_date": "2021-06-23T12:16:00.000Z",
      "revision_history": [
        {
          "date": "2021-06-23T12:16:00.000Z",
          "number": "1",
          "summary": "Initial revision."
        },
        {
          "date": "2025-02-10T09:00:00.000Z",
          "number": "2",
          "summary": "Update: Provider data has been corrected"
        },
        {
          "date": "2025-05-14T12:28:19.000Z",
          "number": "3",
          "summary": "Fix: version space, firmware category, added distribution"
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "FL COMSERVER UNI 232/422/485",
                "product": {
                  "name": "FL COMSERVER UNI 232/422/485",
                  "product_id": "CSAFPID-11001",
                  "product_identification_helper": {
                    "model_numbers": [
                      "2313452"
                    ]
                  }
                }
              },
              {
                "category": "product_name",
                "name": "FL COMSERVER UNI 232/422/485-T",
                "product": {
                  "name": "FL COMSERVER UNI 232/422/485-T",
                  "product_id": "CSAFPID-11002",
                  "product_identification_helper": {
                    "model_numbers": [
                      "2904817"
                    ]
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Hardware"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c2.40",
                "product": {
                  "name": " Firmware \u003c2.40",
                  "product_id": "CSAFPID-21001"
                }
              },
              {
                "category": "product_version",
                "name": "2.41",
                "product": {
                  "name": "Firmware 2.41",
                  "product_id": "CSAFPID-22001"
                }
              }
            ],
            "category": "product_family",
            "name": "Firmware"
          }
        ],
        "category": "vendor",
        "name": "PHOENIX CONTACT"
      }
    ],
    "product_groups": [
      {
        "group_id": "CSAFGID-0001",
        "product_ids": [
          "CSAFPID-31001",
          "CSAFPID-31002"
        ],
        "summary": "Affected Products."
      },
      {
        "group_id": "CSAFGID-0002",
        "product_ids": [
          "CSAFPID-32001",
          "CSAFPID-32002"
        ],
        "summary": "fixed product."
      }
    ],
    "relationships": [
      {
        "category": "installed_on",
        "full_product_name": {
          "name": " Firmware \u003c2.40 installed on FL COMSERVER UNI 232/422/485",
          "product_id": "CSAFPID-31001"
        },
        "product_reference": "CSAFPID-21001",
        "relates_to_product_reference": "CSAFPID-11001"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": " Firmware \u003c2.40 installed on FL COMSERVER UNI 232/422/485-T",
          "product_id": "CSAFPID-31002"
        },
        "product_reference": "CSAFPID-21001",
        "relates_to_product_reference": "CSAFPID-11002"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware 2.41 installed on FL COMSERVER UNI 232/422/485",
          "product_id": "CSAFPID-32001"
        },
        "product_reference": "CSAFPID-22001",
        "relates_to_product_reference": "CSAFPID-11001"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware 2.41 installed on FL COMSERVER UNI 232/422/485-T",
          "product_id": "CSAFPID-32002"
        },
        "product_reference": "CSAFPID-22001",
        "relates_to_product_reference": "CSAFPID-11002"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-21002",
      "cwe": {
        "id": "CWE-772",
        "name": "Missing Release of Resource after Effective Lifetime"
      },
      "notes": [
        {
          "category": "description",
          "text": "In Phoenix Contact FL COMSERVER UNI in versions \u003c2.40 a invalid Modbus exception response can lead to a temporary denial of service.",
          "title": "Vulnerability Description"
        }
      ],
      "product_status": {
        "fixed": [
          "CSAFPID-32001",
          "CSAFPID-32002"
        ],
        "known_affected": [
          "CSAFPID-31001",
          "CSAFPID-31002"
        ]
      },
      "remediations": [
        {
          "category": "mitigation",
          "details": "Phoenix Contact recommends operating network-capable devices in closed networks or protected with a suitable firewall. For detailed information on our recommendations for measures to protect network-capable devices, please refer to our application note:\nMeasures to protect network-capable devices with Ethernet connection",
          "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"
          ]
        }
      ],
      "title": "CVE-2021-21002"
    }
  ]
}



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