Vulnerability-Lookup

CVE-2026-55732 (GCVE-0-2026-55732)

Vulnerability from cvelistv5 – Published: 2026-07-24 14:00 – Updated: 2026-07-24 14:53

Title

Loytec LINX firmware: Out-of-bounds Read in BACnet packet parsing (bacdt_datetime_to_tod)

Summary

Out-of-bounds Read (CWE-125) in BACnet packet parsing (`bacdt_datetime_to_tod`) in Loytec LIP-ME201C, L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.18 on LINX-A64 allows an unauthenticated remote attacker to crash `linx_a64.exe` and ultimately reboot the device via a malformed BACnet TimeSynchronization or UTC-TimeSynchronization packet with an invalid month value. The same vulnerability affects multiple other Loytec products.

Severity

8.7 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-24 14:53 UTC

CWE

CWE-125 - Out-of-bounds read

Assigner

NCSC.ch mitre root

References

1 reference

URL	Tags
https://www.loytec.com/support/product-security/a…	vendor-advisory

Impacted products

8 products

Vendor	Product	Version	CPE status
Loytec	LIP-ME20xC	Affected: 0 , ≤ 8.4.18 (custom)	guessed
Loytec	L-INX	Affected: 0 , ≤ 8.4.18 (custom)	guessed
Loytec	L-GATE	Affected: 0 , ≤ 8.4.18 (custom)	guessed
Loytec	L-ROC	Affected: 0 , ≤ 8.4.18 (custom)	guessed
Loytec	L-IOB	Affected: 0 , ≤ 8.4.18 (custom)	guessed
Loytec	L-DALI	Affected: 0 , ≤ 8.4.18 (custom)	guessed
Loytec	L-VIS	Affected: 0 , ≤ 8.4.18 (custom)	guessed
Loytec	L-PAD	Affected: 0 , ≤ 8.4.18 (custom)	guessed

Credits

Daniel Hulliger, armasuisse CYD Campus Damian Pfammatter, armasuisse CYD Campus

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2026-55732

Vulnerability from fkie_nvd - Published: 2026-07-24 15:18 - Updated: 2026-07-27 20:32

Severity

8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	vulnerability@ncsc.ch	https://www.loytec.com/support/product-security/advisories/8532-dibt-cve-20260608-0001-bacnet-crash-due-to-invalid-timesync-message-high

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
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          "defaultStatus": "unaffected",
          "product": "LIP-ME20xC",
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        },
        {
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          "vendor": "Loytec",
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              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "L-ROC",
          "vendor": "Loytec",
          "versions": [
            {
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              "status": "affected",
              "version": "0",
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            }
          ]
        },
        {
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          "product": "L-IOB",
          "vendor": "Loytec",
          "versions": [
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        {
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          ]
        },
        {
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          "product": "L-VIS",
          "vendor": "Loytec",
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  ],
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            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-24T14:53:38.766440Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-24T15:18:31.543",
  "references": [
    {
      "source": "vulnerability@ncsc.ch",
      "url": "https://www.loytec.com/support/product-security/advisories/8532-dibt-cve-20260608-0001-bacnet-crash-due-to-invalid-timesync-message-high"
    }
  ],
  "sourceIdentifier": "vulnerability@ncsc.ch",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "vulnerability@ncsc.ch",
      "type": "Secondary"
    }
  ]
}

GHSA-6JQH-RGP9-536F

Vulnerability from github – Published: 2026-07-24 15:33 – Updated: 2026-07-24 15:33

Details

Out-of-bounds Read (CWE-125) in BACnet packet parsing (bacdt_datetime_to_tod) in Loytec LIP-ME201C, L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.18 on LINX-A64 allows an unauthenticated remote attacker to crash linx_a64.exe and ultimately reboot the device via a malformed BACnet TimeSynchronization or UTC-TimeSynchronization packet with an invalid month value. The same vulnerability affects multiple other Loytec products.

Severity

8.7 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-55732"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-24T15:18:31Z",
    "severity": "HIGH"
  },
  "details": "Out-of-bounds Read (CWE-125)\u00a0in BACnet packet parsing (`bacdt_datetime_to_tod`) in Loytec LIP-ME201C,\u00a0L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.18 on LINX-A64 allows an unauthenticated remote attacker to crash `linx_a64.exe` and ultimately reboot the device via a malformed BACnet TimeSynchronization or UTC-TimeSynchronization packet with an invalid month value. The same vulnerability affects multiple other Loytec products.",
  "id": "GHSA-6jqh-rgp9-536f",
  "modified": "2026-07-24T15:33:02Z",
  "published": "2026-07-24T15:33:02Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55732"
    },
    {
      "type": "WEB",
      "url": "https://www.loytec.com/support/product-security/advisories/8532-dibt-cve-20260608-0001-bacnet-crash-due-to-invalid-timesync-message-high"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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"
    }
  ]
}

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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-55732 (GCVE-0-2026-55732)

FKIE_CVE-2026-55732

GHSA-6JQH-RGP9-536F

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Related by attack behaviour