Vulnerability-Lookup

FKIE_CVE-2026-54410

Vulnerability from fkie_nvd - Published: 2026-06-14 18:17 - Updated: 2026-08-10 12:17

Severity

8.6 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Summary

nanoMODBUS through v1.23.0 contains an off-by-one buffer overflow in the recv_msg_header function of the Modbus/TCP server that allows remote unauthenticated attackers to write one attacker-controlled byte past the end of the 260-byte receive buffer by sending a crafted MBAP frame whose Length field is set to 255.

References

	URL	Tags
	309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c	https://cwe.mitre.org/data/definitions/193.html
	309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c	https://cwe.mitre.org/data/definitions/787.html
	309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c	https://github.com/debevv/nanoMODBUS
	309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c	https://github.com/debevv/nanoMODBUS/blob/v1.23.0/nanomodbus.c#L369

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://github.com/debevv/nanoMODBUS",
          "defaultStatus": "unknown",
          "product": "nanoMODBUS",
          "programFiles": [
            "nanomodbus.c"
          ],
          "programRoutines": [
            {
              "name": "recv_msg_header"
            }
          ],
          "repo": "https://github.com/debevv/nanoMODBUS",
          "vendor": "debevv",
          "versions": [
            {
              "lessThanOrEqual": "1.23.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "nanoMODBUS through v1.23.0 contains an off-by-one buffer overflow in the recv_msg_header function of the Modbus/TCP server that allows remote unauthenticated attackers to write one attacker-controlled byte past the end of the 260-byte receive buffer by sending a crafted MBAP frame whose Length field is set to 255."
    },
    {
      "lang": "es",
      "value": "nanoMODBUS hasta la v1.23.0 contiene un desbordamiento de b\u00fafer por un byte en la funci\u00f3n recv_msg_header() del servidor Modbus/TCP que permite a atacantes remotos no autenticados escribir un byte controlado por el atacante m\u00e1s all\u00e1 del final del b\u00fafer de recepci\u00f3n de 260 bytes enviando una trama MBAP manipulada cuyo campo Length est\u00e1 configurado en 255. El desbordamiento corrompe el campo adyacente buffer-index de la estructura de estado de nanoMODBUS, lo que resulta en denegaci\u00f3n de servicio a trav\u00e9s de accesos a memoria no v\u00e1lidos y, en objetivos bare-metal y RTOS sin protecci\u00f3n de memoria, revelaci\u00f3n de informaci\u00f3n de un byte y escrituras a direcciones de registro no intencionadas en la ruta del gestor de Write Multiple Registers (FC16)."
    }
  ],
  "id": "CVE-2026-54410",
  "lastModified": "2026-08-10T12:17:16.943",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 9.0,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:C",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 8.5,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
        "type": "Secondary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.6,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.7,
        "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
        "type": "Secondary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "YES",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "PROOF_OF_CONCEPT",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P/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:Y/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-54410",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-15T17:00:11.456275Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-06-14T18:17:20.330",
  "references": [
    {
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
      "url": "https://cwe.mitre.org/data/definitions/193.html"
    },
    {
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
      "url": "https://cwe.mitre.org/data/definitions/787.html"
    },
    {
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
      "url": "https://github.com/debevv/nanoMODBUS"
    },
    {
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
      "url": "https://github.com/debevv/nanoMODBUS/blob/v1.23.0/nanomodbus.c#L369"
    }
  ],
  "sourceIdentifier": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-193"
        },
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
      "type": "Secondary"
    }
  ]
}

CVE-2026-54410 (GCVE-0-2026-54410)

Vulnerability from cvelistv5 – Published: 2026-06-14 17:10 – Updated: 2026-08-10 11:43

Title

nanoMODBUS Off-by-One Buffer Overflow in recv_msg_header() via Crafted MBAP Length Field

Summary

Severity

7.8 (High)


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

8.6 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-15 17:00 UTC

CWE

CWE-193 - Off-by-one Error
CWE-787 - Out-of-bounds Write

Assigner

TuranSec

References

4 references

URL	Tags
https://github.com/debevv/nanoMODBUS	product
https://github.com/debevv/nanoMODBUS/blob/v1.23.0…	product
https://cwe.mitre.org/data/definitions/193.html	technical-description
https://cwe.mitre.org/data/definitions/787.html	technical-description

Impacted products

1 product

Vendor	Product	Version
debevv	nanoMODBUS	Affected: 0 , ≤ 1.23.0 (semver)

Date Public

2026-06-14 17:10

Credits

Burxonov Muslimbek

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-54410",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-15T17:00:11.456275Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-15T17:05:25.499Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://github.com/debevv/nanoMODBUS",
          "defaultStatus": "unknown",
          "product": "nanoMODBUS",
          "programFiles": [
            "nanomodbus.c"
          ],
          "programRoutines": [
            {
              "name": "recv_msg_header"
            }
          ],
          "repo": "https://github.com/debevv/nanoMODBUS",
          "vendor": "debevv",
          "versions": [
            {
              "lessThanOrEqual": "1.23.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Burxonov Muslimbek"
        }
      ],
      "datePublic": "2026-06-14T17:10:12.275Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003enanoMODBUS through v1.23.0 contains an off-by-one buffer overflow in the recv_msg_header function of the Modbus/TCP server that allows remote unauthenticated attackers to write one attacker-controlled byte past the end of the 260-byte receive buffer by sending a crafted MBAP frame whose Length field is set to 255.\u003c/p\u003e"
            }
          ],
          "value": "nanoMODBUS through v1.23.0 contains an off-by-one buffer overflow in the recv_msg_header function of the Modbus/TCP server that allows remote unauthenticated attackers to write one attacker-controlled byte past the end of the 260-byte receive buffer by sending a crafted MBAP frame whose Length field is set to 255."
        }
      ],
      "impacts": [
        {
          "descriptions": [
            {
              "lang": "en",
              "value": "A remote unauthenticated attacker who can reach a Modbus/TCP server built on nanoMODBUS can send a crafted MBAP frame with the Length field set to 255 to overflow the 260-byte receive buffer by one byte, corrupting the adjacent buf_idx field of the nmbs_t struct with an attacker-controlled value. This yields denial of service (subsequent handler calls treat the corrupted buf_idx as a register count / offset and crash, hang, or return invalid data), one-byte information disclosure on bare-metal and RTOS targets without memory protection (ARM Cortex-M, ESP32, STM32 class), and the possibility of writing to unintended register addresses on the FC16 (Write Multiple Registers) handler path. No authentication, no user interaction, and no special configuration are required."
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "YES",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "exploitMaturity": "PROOF_OF_CONCEPT",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P/AU:Y",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "An attacker who can reach the TCP listening port of a Modbus/TCP server built on nanoMODBUS (typically TCP/502 on industrial / OT networks) sends a single crafted MBAP frame with Length=255 to corrupt the buf_idx field of the nmbs_t struct, causing denial of service or, on memory-protection-less embedded targets, additional information disclosure or unintended register writes."
            }
          ]
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV2_0": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 9,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:C",
            "version": "2.0"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-193",
              "description": "CWE-193 Off-by-one Error",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-787",
              "description": "CWE-787 Out-of-bounds Write",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-10T11:43:54.292Z",
        "orgId": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
        "shortName": "TuranSec"
      },
      "references": [
        {
          "name": "nanoMODBUS - upstream repository (vendor)",
          "tags": [
            "product"
          ],
          "url": "https://github.com/debevv/nanoMODBUS"
        },
        {
          "name": "Vulnerable bounds check at nanomodbus.c line 369 (v1.23.0)",
          "tags": [
            "product"
          ],
          "url": "https://github.com/debevv/nanoMODBUS/blob/v1.23.0/nanomodbus.c#L369"
        },
        {
          "name": "CWE-193: Off-by-one Error",
          "tags": [
            "technical-description"
          ],
          "url": "https://cwe.mitre.org/data/definitions/193.html"
        },
        {
          "name": "CWE-787: Out-of-bounds Write",
          "tags": [
            "technical-description"
          ],
          "url": "https://cwe.mitre.org/data/definitions/787.html"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "nanoMODBUS Off-by-One Buffer Overflow in recv_msg_header() via Crafted MBAP Length Field",
      "x_assigner_notes": "Vendor \u0027debevv\u0027 is a single-maintainer GitHub account; nanoMODBUS is MIT-licensed. The vulnerable bounds check was verified by source inspection of v1.22.0, v1.22.1, and v1.23.0 (latest at publish time) - the issue is present in all three; affected range is therefore 0 through v1.23.0 (inclusive) with defaultStatus \u0027unknown\u0027 pending vendor confirmation of a fixed release. CVSS scoring follows the submitter\u0027s CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H = 8.6) and translates to 4.0 with VC:L/VI:L/VA:H, SC/SI/SA:N (= 8.7) and 2.0 with C:P/I:P/A:C (= 9.0).",
      "x_author": "Burxonov Muslimbek"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
    "assignerShortName": "TuranSec",
    "cveId": "CVE-2026-54410",
    "datePublished": "2026-06-14T17:10:12.275Z",
    "dateReserved": "2026-06-13T16:39:46.122Z",
    "dateUpdated": "2026-08-10T11:43:54.292Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

FKIE_CVE-2026-54410

CVE-2026-54410 (GCVE-0-2026-54410)

Tags

Sightings

Nomenclature