Vulnerability-Lookup

CVE-2026-14837 (GCVE-0-2026-14837)

Vulnerability from cvelistv5 – Published: 2026-07-27 07:03 – Updated: 2026-07-27 14:01

Title

SSH Enablement Signature Verification Bypass

Summary

Multiple Lenze products are affected by an improper signature verification vulnerability in the SSH enablement mechanism. A low-privileged local attacker can bypass verification of the SSH enable file signature and enable SSH access on the device. Successful exploitation may result in unauthorized administrative access and complete system compromise.

Severity

8.5 (High)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-347 - Improper Verification of Cryptographic Signature

Assigner

CERTVDE

References

1 reference

URL	Tags
https://www.certvde.com/en/advisories/VDE-2026-077/

Impacted products

5 products

Vendor	Product	Version
Lenze	c430	Affected: 1.0.0 , < 1.15.2 (semver)
Lenze	c520	Affected: 1.0.0 , < 1.15.2 (semver)
Lenze	c550	Affected: 1.0.0 , < 1.15.2 (semver)
Lenze	i950 GenA	Affected: 1.0.0 , < 1.14.2 (semver)
Lenze	i950 GenB	Affected: 2.0.0 , < 2.0.3 (semver)

Show details on NVD website

JSON

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GHSA-FCW6-HWX8-WWX8

Vulnerability from github – Published: 2026-07-27 09:31 – Updated: 2026-07-27 09:31

Details

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

8.5 (High)


                  
                    CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

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  "id": "GHSA-fcw6-hwx8-wwx8",
  "modified": "2026-07-27T09:31:26Z",
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    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

VDE-2026-077

Vulnerability from csaf_lenzese - Published: 2026-07-27 10:00 - Updated: 2026-07-27 10:00

Summary

Lenze: Incorrect signature validation in the enable SSH routine

Severity

High

Notes

Summary: The affected products belong to the Controller or Servo Drive product family and contain a vulnerability in a security-critical activation mechanism for service access. The signature verification of a file used for SSH activation can be compromised, which could allow unauthorized access to the device.

General Recommendations: The cyber security documentation currently describes some of the implemented functions and is thus intended to provide clarity in the functions described here.

Disclamer: Lenze SE assumes no liability whatsoever for any kind of losses or consequential losses that occur by the distribution and/or use of this document . All information published in this document is provided on good faith by Lenze SE. Insofar as permissible by law, however, none of this information shall establish any guarantee, commitment or liability on the part of Lenze SE. Lenze SE reserves the right to change or update this document at any time.

Impact: This vulnerability could compromise the confidentiality, integrity, and availability of the product.

Remediation: To resolve this security vulnerability, we recommend installing a firmware update. | Product | Firmware | Fixed Version | | --------------- | -------- | ------------- | | Controller c430 | c4xx | 1.15.2 | | c520 | c5xx | 1.15.2 | | c550 | c5xx | 1.15.2 | | i950 GenA | i950 | 1.15.0 | | i950 GenB | i950 | 2.0.3 |

Mitigation: Check to see if there is an activation file on the SD Card, and delete it. In addition, it is recommended that you protect each access path with appropriate measures, such as physically securing access to the SD Card, authorizing file transfers via PLC Designer (if supported by the respective product), authorizing file transfers via OPC UA (if supported by the respective product), and customizing the key for SFTP access.

CVE-2026-14837

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-347 - Improper Verification of Cryptographic Signature

Vendor Fix To resolve this security vulnerability, we recommend installing a firmware update. | Product | Firmware | Fixed Version | | --------------- | -------- | ------------- | | Controller c430 | c4xx | 1.15.2 | | c520 | c5xx | 1.15.2 | | c550 | c5xx | 1.15.2 | | i950 GenA | i950 | 1.15.0 | | i950 GenB | i950 | 2.0.3 |

Mitigation Check to see if there is an activation file on the SD Card, and delete it. In addition, it is recommended that you protect each access path with appropriate measures, such as physically securing access to the SD Card, authorizing file transfers via PLC Designer (if supported by the respective product), authorizing file transfers via OPC UA (if supported by the respective product), and customizing the key for SFTP access.

Affected products

Fixed 5 products

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		—

Known affected 5 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		—

References

5 references

URL	Category
https://www.lenze.com/en-de/services/cyber-security	external
https://certvde.com/en/advisories/vendor/lenze/	external
https://certvde.com/en/advisories/VDE-2026-077/	self
https://lenze.csaf-tp.certvde.com/.well-known/csa…	self
https://www.first.org/cvss/calculator/4.0#CVSS:4.…	external

Acknowledgments

CERT@VDE certvde.com

JSON

To clipboard

{
  "document": {
    "acknowledgments": [
      {
        "organization": "CERT@VDE",
        "summary": "coordination",
        "urls": [
          "https://certvde.com"
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      }
    ],
    "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",
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    "notes": [
      {
        "category": "summary",
        "text": "The affected products belong to the Controller or Servo Drive product family and contain a vulnerability in a security-critical activation mechanism for service access. The signature verification of a file used for SSH activation can be compromised, which could allow unauthorized access to the device.",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "The cyber security documentation currently describes some of the implemented functions and is thus intended to provide clarity in the functions described here.",
        "title": "General Recommendations"
      },
      {
        "category": "legal_disclaimer",
        "text": "Lenze SE assumes no liability whatsoever for any kind of losses or consequential losses that occur by the distribution and/or use of this document . All information published in this document is provided on good faith by Lenze SE. Insofar as permissible by law, however, none of this information shall establish any guarantee, commitment or liability on the part of Lenze SE. Lenze SE reserves the right to change or update this document at any time.",
        "title": "Disclamer"
      },
      {
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        "text": "This vulnerability could compromise the confidentiality, integrity, and availability of the product.",
        "title": "Impact"
      },
      {
        "category": "description",
        "text": "To resolve this security vulnerability, we recommend installing a firmware update.\n\n| Product         | Firmware | Fixed Version |\n| --------------- | -------- | ------------- |\n| Controller c430 | c4xx     | 1.15.2        |\n| c520            | c5xx     | 1.15.2        |\n| c550            | c5xx     | 1.15.2        |\n| i950 GenA       | i950     | 1.15.0        |\n| i950 GenB       | i950     | 2.0.3         |\n",
        "title": "Remediation"
      },
      {
        "category": "description",
        "text": "Check to see if there is an activation file on the SD Card, and delete it. In addition, it is recommended that you protect each access path with appropriate measures, such as physically securing access to the SD Card, authorizing file transfers via PLC Designer (if supported by the respective product), authorizing file transfers via OPC UA (if supported by the respective product), and customizing the key for SFTP access.",
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        "category": "external",
        "summary": "Lenze SE has a Product Security Incident Response Team (PSIRT) with its own communication channel. Contact us via https://www.lenze.com/ and the Service and Cyber Security tab.",
        "url": "https://www.lenze.com/en-de/services/cyber-security"
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      },
      {
        "category": "self",
        "summary": "VDE-2026-077: Lenze: Incorrect signature validation in the enable SSH routine - HTML",
        "url": "https://certvde.com/en/advisories/VDE-2026-077/"
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      {
        "category": "self",
        "summary": "VDE-2026-077: Lenze: Incorrect signature validation in the enable SSH routine - CSAF",
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    "title": "Lenze: Incorrect signature validation in the enable SSH routine",
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      ],
      "status": "final",
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  },
  "product_tree": {
    "branches": [
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        "branches": [
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "product_name",
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                  {
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                      "name": "Firmware c4x0 \u003c1.15.2",
                      "product_id": "CSAFPID-21001",
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                        "cpe": "cpe:2.3:o:lenze:c4xx_firmware:*:*:*:*:*:*:*:*"
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                        "cpe": "cpe:2.3:o:lenze:c4xx_firmware:1.15.2:*:*:*:*:*:*:*"
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                      "product_id": "CSAFPID-22002",
                      "product_identification_helper": {
                        "cpe": "cpe:2.3:o:lenze:c5xx_firmware:1.15.2:*:*:*:*:*:*:*"
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                    }
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                ],
                "category": "product_family",
                "name": "Firmware c5xx"
              },
              {
                "branches": [
                  {
                    "category": "product_version_range",
                    "name": "vers:semver/\u003e=1.0.0|\u003c1.14.2",
                    "product": {
                      "name": "Firmware i950 \u003c1.14.2",
                      "product_id": "CSAFPID-21003",
                      "product_identification_helper": {
                        "cpe": "cpe:2.3:o:lenze:i950_firmware:*:*:*:*:*:*:*:*"
                      }
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "1.15.0",
                    "product": {
                      "name": "Firmware i950 1.14.3",
                      "product_id": "CSAFPID-22003",
                      "product_identification_helper": {
                        "cpe": "cpe:2.3:o:lenze:i950_firmware:1.15.0:*:*:*:*:*:*:*"
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                    }
                  },
                  {
                    "category": "product_version_range",
                    "name": "vers:semver/\u003e=2.0.0|\u003c2.0.3",
                    "product": {
                      "name": "Firmware i950 \u003c2.0.2",
                      "product_id": "CSAFPID-21004",
                      "product_identification_helper": {
                        "cpe": "cpe:2.3:o:lenze:i950_firmware:*:*:*:*:*:*:*:*"
                      }
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "2.0.3",
                    "product": {
                      "name": "Firmware i950 2.0.3",
                      "product_id": "CSAFPID-22004",
                      "product_identification_helper": {
                        "cpe": "cpe:2.3:o:lenze:i950_firmware:2.0.3:*:*:*:*:*:*:*"
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              }
            ],
            "category": "product_family",
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          }
        ],
        "category": "vendor",
        "name": "Lenze"
      }
    ],
    "product_groups": [
      {
        "group_id": "CSAFGID-0001",
        "product_ids": [
          "CSAFPID-31001",
          "CSAFPID-31002",
          "CSAFPID-31003",
          "CSAFPID-31004",
          "CSAFPID-31005"
        ],
        "summary": "Affected Products."
      },
      {
        "group_id": "CSAFGID-0002",
        "product_ids": [
          "CSAFPID-32001",
          "CSAFPID-32002",
          "CSAFPID-32003",
          "CSAFPID-32004",
          "CSAFPID-32005"
        ],
        "summary": "Fixed Products."
      }
    ],
    "relationships": [
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware c4xx \u003c1.15.2 installed on Controller c430",
          "product_id": "CSAFPID-31001",
          "product_identification_helper": {
            "cpe": "cpe:2.3:o:lenze:c4xx_firmware:*:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-21001",
        "relates_to_product_reference": "CSAFPID-13001"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware c4xx 1.15.2 installed on Controller c430",
          "product_id": "CSAFPID-32001",
          "product_identification_helper": {
            "cpe": "cpe:2.3:o:lenze:c4xx_firmware:1.15.2:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-22001",
        "relates_to_product_reference": "CSAFPID-13001"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware c5xx \u003c1.15.2 installed on Controller c520",
          "product_id": "CSAFPID-31002",
          "product_identification_helper": {
            "cpe": "cpe:2.3:o:lenze:c5xx_firmware:*:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-21002",
        "relates_to_product_reference": "CSAFPID-13002"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware c5xx \u003c1.15.2 installed on c550",
          "product_id": "CSAFPID-31003",
          "product_identification_helper": {
            "cpe": "cpe:2.3:o:lenze:c5xx_firmware:*:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-21002",
        "relates_to_product_reference": "CSAFPID-13003"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware c5xx 1.15.2 installed on c520",
          "product_id": "CSAFPID-32002",
          "product_identification_helper": {
            "cpe": "cpe:2.3:o:lenze:c5xx_firmware:1.15.2:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-22002",
        "relates_to_product_reference": "CSAFPID-13002"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware c5xx 1.15.2 installed on c550",
          "product_id": "CSAFPID-32003",
          "product_identification_helper": {
            "cpe": "cpe:2.3:o:lenze:c5xx_firmware:1.15.2:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-22002",
        "relates_to_product_reference": "CSAFPID-13003"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware i950 \u003c1.14.2 installed on i950 GenA",
          "product_id": "CSAFPID-31004",
          "product_identification_helper": {
            "cpe": "cpe:2.3:o:lenze:i950_firmware:*:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-21003",
        "relates_to_product_reference": "CSAFPID-13004"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware i950 1.15.0 installed on i950 GenA",
          "product_id": "CSAFPID-32004",
          "product_identification_helper": {
            "cpe": "cpe:2.3:o:lenze:i950_firmware:1.15.0:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-22003",
        "relates_to_product_reference": "CSAFPID-13004"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware i950 \u003c2.0.3 installed on i950 GenB",
          "product_id": "CSAFPID-31005",
          "product_identification_helper": {
            "cpe": "cpe:2.3:o:lenze:i950_firmware:*:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-21004",
        "relates_to_product_reference": "CSAFPID-13005"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware i950 2.0.3 installed on i950 GenB",
          "product_id": "CSAFPID-32005",
          "product_identification_helper": {
            "cpe": "cpe:2.3:o:lenze:i950_firmware:2.0.3:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-22004",
        "relates_to_product_reference": "CSAFPID-13005"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-14837",
      "cwe": {
        "id": "CWE-347",
        "name": "Improper Verification of Cryptographic Signature"
      },
      "notes": [
        {
          "category": "description",
          "text": "Multiple Lenze products are affected by an improper signature verification vulnerability in the SSH enablement mechanism. A low-privileged local attacker can bypass verification of the SSH enable file signature and enable SSH access on the device. Successful exploitation may result in unauthorized administrative access and complete system compromise.",
          "title": "CVE Description"
        }
      ],
      "product_status": {
        "fixed": [
          "CSAFPID-32001",
          "CSAFPID-32002",
          "CSAFPID-32003",
          "CSAFPID-32004",
          "CSAFPID-32005"
        ],
        "known_affected": [
          "CSAFPID-31001",
          "CSAFPID-31002",
          "CSAFPID-31003",
          "CSAFPID-31004",
          "CSAFPID-31005"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - 8.5 / High",
          "url": "https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To resolve this security vulnerability, we recommend installing a firmware update.\n\n| Product         | Firmware | Fixed Version |\n| --------------- | -------- | ------------- |\n| Controller c430 | c4xx     | 1.15.2        |\n| c520            | c5xx     | 1.15.2        |\n| c550            | c5xx     | 1.15.2        |\n| i950 GenA       | i950     | 1.15.0        |\n| i950 GenB       | i950     | 2.0.3         |\n",
          "group_ids": [
            "CSAFGID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "Check to see if there is an activation file on the SD Card, and delete it. In addition, it is recommended that you protect each access path with appropriate measures, such as physically securing access to the SD Card, authorizing file transfers via PLC Designer (if supported by the respective product), authorizing file transfers via OPC UA (if supported by the respective product), and customizing the key for SFTP access.",
          "group_ids": [
            "CSAFGID-0001"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "environmentalScore": 7.8,
            "environmentalSeverity": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "temporalScore": 7.8,
            "temporalSeverity": "HIGH",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-31001",
            "CSAFPID-31002",
            "CSAFPID-31003",
            "CSAFPID-31004",
            "CSAFPID-31005"
          ]
        }
      ],
      "title": "SSH Enablement Signature Verification Bypass"
    }
  ]
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-14837 (GCVE-0-2026-14837)

GHSA-FCW6-HWX8-WWX8

VDE-2026-077

Tags

Sightings

Nomenclature