VDE-2026-004

Vulnerability from csaf_wagogmbhcokg - Published: 2026-02-09 08:00 - Updated: 2026-02-09 08:00
Summary
WAGO: Vulnerabilities in Managed Switch
Severity
High
Notes
Summary: Several vulnerabilities have been identified in the WAGO 852‑1328 device's web‑based management interface, which is implemented using a modified lighttpd server and custom CGI binaries. These issues include multiple stack buffer overflows, an authentication bypass, and insecure credential storage.
Impact: Successful exploitation may allow remote attackers to crash the web service, execute arbitrary code, bypass authentication controls, and obtain plaintext administrative credentials.
Remediation: Please update your devices to the specified fixed firmware version 02.65.
CVE-2026-22903

An unauthenticated remote attacker can send a crafted HTTP request containing an overly long SESSIONID cookie. This can trigger a stack buffer overflow in the modified lighttpd server, causing it to crash and potentially enabling remote code execution due to missing stack protections.

9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-121 - Stack-based Buffer Overflow
Vendor Fix Please update your devices to the specified fixed firmware version 02.65.
Affected products
Product Identifier Version Remediation
Unresolved product id: CSAFPID-32001 —
Unresolved product id: CSAFPID-32002 —
Product Identifier Version Remediation
Unresolved product id: CSAFPID-31001 —
Unresolved product id: CSAFPID-31002 —
Unresolved product id: CSAFPID-31003 —
Unresolved product id: CSAFPID-31004 —
CVE-2026-22904

Improper length handling when parsing multiple cookie fields (including TRACKID) allows an unauthenticated remote attacker to send oversized cookie values and trigger a stack buffer overflow, resulting in a denial‑of‑service condition and possible remote code execution.

9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-121 - Stack-based Buffer Overflow
Vendor Fix Please update your devices to the specified fixed firmware version 02.65.
Affected products
Product Identifier Version Remediation
Unresolved product id: CSAFPID-32001 —
Unresolved product id: CSAFPID-32002 —
Product Identifier Version Remediation
Unresolved product id: CSAFPID-31001 —
Unresolved product id: CSAFPID-31002 —
Unresolved product id: CSAFPID-31003 —
Unresolved product id: CSAFPID-31004 —
CVE-2026-22905

An unauthenticated remote attacker can bypass authentication by exploiting insufficient URI validation and using path traversal sequences (e.g., /js/../cgi-bin/post.cgi), gaining unauthorized access to protected CGI endpoints and configuration downloads.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Vendor Fix Please update your devices to the specified fixed firmware version 02.65.
Affected products
Product Identifier Version Remediation
Unresolved product id: CSAFPID-32001 —
Unresolved product id: CSAFPID-32002 —
Product Identifier Version Remediation
Unresolved product id: CSAFPID-31001 —
Unresolved product id: CSAFPID-31002 —
Unresolved product id: CSAFPID-31003 —
Unresolved product id: CSAFPID-31004 —
CVE-2026-22906

User credentials are stored using AES‑ECB encryption with a hardcoded key. An unauthenticated remote attacker obtaining the configuration file can decrypt and recover plaintext usernames and passwords, especially when combined with the authentication bypass.

9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-321 - Use of Hard-coded Cryptographic Key
Vendor Fix Please update your devices to the specified fixed firmware version 02.65.
Affected products
Product Identifier Version Remediation
Unresolved product id: CSAFPID-32001 —
Unresolved product id: CSAFPID-32002 —
Product Identifier Version Remediation
Unresolved product id: CSAFPID-31001 —
Unresolved product id: CSAFPID-31002 —
Unresolved product id: CSAFPID-31003 —
Unresolved product id: CSAFPID-31004 —
References
Acknowledgments
CERT@VDE
Diconium
To clipboard 

{
  "document": {
    "acknowledgments": [
      {
        "organization": "CERT@VDE",
        "summary": "coordination"
      },
      {
        "organization": "Diconium",
        "summary": "reporting"
      }
    ],
    "aggregate_severity": {
      "namespace": "https://www.first.org/cvss/v3.1/specification-document#Qualitative-Severity-Rating-Scale",
      "text": "High"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-GB",
    "notes": [
      {
        "category": "summary",
        "text": "Several vulnerabilities have been identified in the WAGO 852\u20111328 device\u0027s web\u2011based management interface, which is implemented using a modified lighttpd server and custom CGI binaries. These issues include multiple stack buffer overflows, an authentication bypass, and insecure credential storage.",
        "title": "Summary"
      },
      {
        "category": "description",
        "text": "Successful exploitation may allow remote attackers to crash the web service, execute arbitrary code, bypass authentication controls, and obtain plaintext administrative credentials.",
        "title": "Impact"
      },
      {
        "category": "description",
        "text": "Please update your devices to the specified fixed firmware version 02.65.",
        "title": "Remediation"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "psirt@wago.com",
      "name": "WAGO GmbH \u0026 Co. KG",
      "namespace": "https://www.wago.com/psirt"
    },
    "references": [
      {
        "category": "self",
        "summary": "WAGO PSIRT",
        "url": "https://www.wago.com/de-en/automation-technology/psirt"
      },
      {
        "category": "external",
        "summary": "CERT@VDE Security Advisories for WAGO",
        "url": "https://certvde.com/de/advisories/vendor/wago/"
      },
      {
        "category": "self",
        "summary": "VDE-2026-004: WAGO: Vulnerabilities in Managed Switch - HTML",
        "url": "https://certvde.com/en/advisories/VDE-2026-004"
      },
      {
        "category": "self",
        "summary": "VDE-2026-004: WAGO: Vulnerabilities in Managed Switch - CSAF",
        "url": "https://wago.csaf-tp.certvde.com/.well-known/csaf/white/2026/vde-2026-004.json"
      }
    ],
    "title": "WAGO: Vulnerabilities in Managed Switch",
    "tracking": {
      "aliases": [
        "VDE-2026-004"
      ],
      "current_release_date": "2026-02-09T08:00:00.000Z",
      "generator": {
        "date": "2026-02-05T10:35:01.126Z",
        "engine": {
          "name": "Secvisogram",
          "version": "2.5.42"
        }
      },
      "id": "VDE-2026-004",
      "initial_release_date": "2026-02-09T08:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-02-09T08:00:00.000Z",
          "number": "1.0.0",
          "summary": "Release version."
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "product_name",
                    "name": "0852-1322",
                    "product": {
                      "name": "Industrial-Managed-Switch 0852-1322",
                      "product_id": "CSAFPID-11001",
                      "product_identification_helper": {
                        "model_numbers": [
                          "0852-1322"
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                      }
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                  },
                  {
                    "category": "product_name",
                    "name": "0852-1328",
                    "product": {
                      "name": "Industrial-Managed-Switch 0852-1328",
                      "product_id": "CSAFPID-11002",
                      "product_identification_helper": {
                        "model_numbers": [
                          "0852-1328"
                        ]
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                  }
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                "category": "product_family",
                "name": "Industrial-Managed-Switch"
              }
            ],
            "category": "product_family",
            "name": "Hardware"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:generic/\u003c=2.64",
                "product": {
                  "name": "Firmware vers:generic/\u003c=2.64",
                  "product_id": "CSAFPID-21001"
                }
              },
              {
                "category": "product_version",
                "name": "2.65",
                "product": {
                  "name": "Firmware 2.65",
                  "product_id": "CSAFPID-22001",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:wago:switch:2.65:*:*:*:*:*:*:*"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "2.64",
                "product": {
                  "name": "Firmware 2.64",
                  "product_id": "CSAFPID-21002",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:wago:switch:2.64:*:*:*:*:*:*:*"
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                }
              }
            ],
            "category": "product_family",
            "name": "Firmware"
          }
        ],
        "category": "vendor",
        "name": "WAGO"
      }
    ],
    "product_groups": [
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        "group_id": "CSAFGID-0001",
        "product_ids": [
          "CSAFPID-31001",
          "CSAFPID-31002",
          "CSAFPID-31003",
          "CSAFPID-31004"
        ],
        "summary": "Affected products"
      },
      {
        "group_id": "CSAFGID-0002",
        "product_ids": [
          "CSAFPID-32001",
          "CSAFPID-32002"
        ],
        "summary": "Fixed products"
      }
    ],
    "relationships": [
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware \u003c=2.64 installed on Industrial-Managed-Switch 0852-1322",
          "product_id": "CSAFPID-31001",
          "product_identification_helper": {
            "model_numbers": [
              "0852-1322"
            ]
          }
        },
        "product_reference": "CSAFPID-21001",
        "relates_to_product_reference": "CSAFPID-11001"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware 2.65 installed on Industrial-Managed-Switch 0852-1322",
          "product_id": "CSAFPID-32001",
          "product_identification_helper": {
            "model_numbers": [
              "0852-1328"
            ]
          }
        },
        "product_reference": "CSAFPID-22001",
        "relates_to_product_reference": "CSAFPID-11001"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware \u003c=2.64 installed on Industrial-Managed-Switch 0852-1328",
          "product_id": "CSAFPID-31002",
          "product_identification_helper": {
            "model_numbers": [
              "0852-1322"
            ]
          }
        },
        "product_reference": "CSAFPID-21001",
        "relates_to_product_reference": "CSAFPID-11002"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware 2.65 installed on Industrial-Managed-Switch 0852-1328",
          "product_id": "CSAFPID-32002",
          "product_identification_helper": {
            "model_numbers": [
              "0852-1328"
            ]
          }
        },
        "product_reference": "CSAFPID-22001",
        "relates_to_product_reference": "CSAFPID-11002"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware 2.64 installed on Industrial-Managed-Switch 0852-1322",
          "product_id": "CSAFPID-31003",
          "product_identification_helper": {
            "model_numbers": [
              "0852-1322"
            ]
          }
        },
        "product_reference": "CSAFPID-21002",
        "relates_to_product_reference": "CSAFPID-11001"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware 2.64 installed on Industrial-Managed-Switch 0852-1328",
          "product_id": "CSAFPID-31004",
          "product_identification_helper": {
            "model_numbers": [
              "0852-1328"
            ]
          }
        },
        "product_reference": "CSAFPID-21002",
        "relates_to_product_reference": "CSAFPID-11002"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-22903",
      "cwe": {
        "id": "CWE-121",
        "name": "Stack-based Buffer Overflow"
      },
      "notes": [
        {
          "category": "description",
          "text": "An unauthenticated remote attacker can send a crafted HTTP request containing an overly long SESSIONID cookie. This can trigger a stack buffer overflow in the modified lighttpd server, causing it to crash and potentially enabling remote code execution due to missing stack protections.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "fixed": [
          "CSAFPID-32001",
          "CSAFPID-32002"
        ],
        "known_affected": [
          "CSAFPID-31001",
          "CSAFPID-31002",
          "CSAFPID-31003",
          "CSAFPID-31004"
        ]
      },
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Please update your devices to the specified fixed firmware version 02.65.",
          "group_ids": [
            "CSAFGID-0001"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "environmentalScore": 9.8,
            "environmentalSeverity": "CRITICAL",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "temporalScore": 9.8,
            "temporalSeverity": "CRITICAL",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-31001",
            "CSAFPID-31002",
            "CSAFPID-31003",
            "CSAFPID-31004"
          ]
        }
      ],
      "title": "Stack Overflow via SESSIONID Cookie in lighttpd"
    },
    {
      "cve": "CVE-2026-22904",
      "cwe": {
        "id": "CWE-121",
        "name": "Stack-based Buffer Overflow"
      },
      "notes": [
        {
          "category": "description",
          "text": "Improper length handling when parsing multiple cookie fields (including TRACKID) allows an unauthenticated remote attacker to send oversized cookie values and trigger a stack buffer overflow, resulting in a denial\u2011of\u2011service condition and possible remote code execution.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "fixed": [
          "CSAFPID-32001",
          "CSAFPID-32002"
        ],
        "known_affected": [
          "CSAFPID-31001",
          "CSAFPID-31002",
          "CSAFPID-31003",
          "CSAFPID-31004"
        ]
      },
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Please update your devices to the specified fixed firmware version 02.65.",
          "group_ids": [
            "CSAFGID-0001"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "environmentalScore": 9.8,
            "environmentalSeverity": "CRITICAL",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "temporalScore": 9.8,
            "temporalSeverity": "CRITICAL",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-31001",
            "CSAFPID-31002",
            "CSAFPID-31003",
            "CSAFPID-31004"
          ]
        }
      ],
      "title": "Stack Overflow via Oversized Cookie Fields in lighttpd"
    },
    {
      "cve": "CVE-2026-22905",
      "cwe": {
        "id": "CWE-22",
        "name": "Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)"
      },
      "notes": [
        {
          "category": "description",
          "text": "An unauthenticated remote attacker can bypass authentication by exploiting insufficient URI validation and using path traversal sequences (e.g., /js/../cgi-bin/post.cgi), gaining unauthorized access to protected CGI endpoints and configuration downloads.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "fixed": [
          "CSAFPID-32001",
          "CSAFPID-32002"
        ],
        "known_affected": [
          "CSAFPID-31001",
          "CSAFPID-31002",
          "CSAFPID-31003",
          "CSAFPID-31004"
        ]
      },
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Please update your devices to the specified fixed firmware version 02.65.",
          "group_ids": [
            "CSAFGID-0001"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "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:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-31001",
            "CSAFPID-31002",
            "CSAFPID-31003",
            "CSAFPID-31004"
          ]
        }
      ],
      "title": "Authentication Bypass via URI Traversal"
    },
    {
      "cve": "CVE-2026-22906",
      "cwe": {
        "id": "CWE-321",
        "name": "Use of Hard-coded Cryptographic Key"
      },
      "notes": [
        {
          "category": "description",
          "text": "User credentials are stored using AES\u2011ECB encryption with a hardcoded key. An unauthenticated remote attacker obtaining the configuration file can decrypt and recover plaintext usernames and passwords, especially when combined with the authentication bypass.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "fixed": [
          "CSAFPID-32001",
          "CSAFPID-32002"
        ],
        "known_affected": [
          "CSAFPID-31001",
          "CSAFPID-31002",
          "CSAFPID-31003",
          "CSAFPID-31004"
        ]
      },
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Please update your devices to the specified fixed firmware version 02.65.",
          "group_ids": [
            "CSAFGID-0001"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "environmentalScore": 9.8,
            "environmentalSeverity": "CRITICAL",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "temporalScore": 9.8,
            "temporalSeverity": "CRITICAL",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-31001",
            "CSAFPID-31002",
            "CSAFPID-31003",
            "CSAFPID-31004"
          ]
        }
      ],
      "title": "Hardcoded Key Allows Credential Disclosure"
    }
  ]
}


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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.