Vulnerability-Lookup

GHSA-FHXV-GC8J-2F6H

Vulnerability from github – Published: 2026-09-29 18:32 – Updated: 2026-09-29 18:32

Details

The TFTP server accepts a DATA datagram of any size. The dispatcher rejects datagrams shorter than

four bytes (nxd_tftp_server.c:1037) and nothing anywhere checks an upper bound, in particular not

against the protocol maximum of 4 + NX_TFTP_FILE_TRANSFER_MAX. Two things follow from that one

missing check, both reachable before any authentication because TFTP has none.

The handler passes nx_packet_length - 4 straight to FileX:




/* addons/tftp/nxd_tftp_server.c:1863, 1889 */



status = nx_packet_copy(packet_ptr, &temp_ptr,

                        server_ptr -> nx_tftp_server_packet_pool_ptr, NX_WAIT_FOREVER);


...



fx_file_write(&(client_request_ptr -> nx_tftp_client_request_file),

              packet_ptr -> nx_packet_prepend_ptr + 4,
              packet_ptr -> nx_packet_length - 4);

nx_packet_length is the length of a chain, not of one contiguous buffer, so FileX copies past the

end of the first packet:




ERROR: AddressSanitizer: heap-buffer-overflow



READ of size 1280 at 0x621000001108 thread T5

    #0 __interceptor_memcpy
    #1 _fx_utility_memory_copy  filex/common/src/fx_utility_memory_copy.c:78


0x621000001108 is 0 bytes to the right of 4104-byte region

Those bytes are written into the file the attacker is uploading, and a TFTP read request hands them

back, so this is a memory disclosure with a convenient retrieval channel.

The same datagram also wedges the server. nx_packet_copy at :1863 needs

ceil(nx_packet_length / pool_payload) packets and asks for them with NX_WAIT_FOREVER, so when the

attacker sizes the datagram beyond what the pool holds, the server thread suspends and never

returns. A liveness probe after one such datagram times out with the pool at 0 of 12 packets and

the server thread suspended, and no later client is served.

Reject nx_packet_length > 4 + NX_TFTP_FILE_TRANSFER_MAX in the DATA branch before either call,

and use a bounded wait rather than NX_WAIT_FOREVER for the copy.

Severity

8.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-102713"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-29T18:17:10Z",
    "severity": "HIGH"
  },
  "details": "The TFTP server accepts a DATA datagram of any size. The dispatcher rejects datagrams shorter than\n\n\n\nfour bytes (nxd_tftp_server.c:1037) and nothing anywhere checks an upper bound, in particular not\n\n\n\nagainst the protocol maximum of 4 + NX_TFTP_FILE_TRANSFER_MAX. Two things follow from that one\n\n\n\nmissing check, both reachable before any authentication because TFTP has none.\n\n\n\nThe handler passes `nx_packet_length - 4` straight to FileX:\n\n\n\n```c\n\n\n\n/* addons/tftp/nxd_tftp_server.c:1863, 1889 */\n\n\n\nstatus = nx_packet_copy(packet_ptr, \u0026temp_ptr,\n\n                        server_ptr -\u003e nx_tftp_server_packet_pool_ptr, NX_WAIT_FOREVER);\n\n\n...\n\n\n\nfx_file_write(\u0026(client_request_ptr -\u003e nx_tftp_client_request_file),\n\n              packet_ptr -\u003e nx_packet_prepend_ptr + 4,\n              packet_ptr -\u003e nx_packet_length - 4);\n\n\n```\n\n\n\n`nx_packet_length` is the length of a chain, not of one contiguous buffer, so FileX copies past the\n\n\n\nend of the first packet:\n\n\n\n```\n\n\n\nERROR: AddressSanitizer: heap-buffer-overflow\n\n\n\nREAD of size 1280 at 0x621000001108 thread T5\n\n    #0 __interceptor_memcpy\n    #1 _fx_utility_memory_copy  filex/common/src/fx_utility_memory_copy.c:78\n\n\n0x621000001108 is 0 bytes to the right of 4104-byte region\n\n\n\n```\n\n\n\nThose bytes are written into the file the attacker is uploading, and a TFTP read request hands them\n\n\n\nback, so this is a memory disclosure with a convenient retrieval channel.\n\n\n\nThe same datagram also wedges the server. `nx_packet_copy` at :1863 needs\n\n\n\nceil(nx_packet_length / pool_payload) packets and asks for them with NX_WAIT_FOREVER, so when the\n\n\n\nattacker sizes the datagram beyond what the pool holds, the server thread suspends and never\n\n\n\nreturns. A liveness probe after one such datagram times out with the pool at 0 of 12 packets and\n\n\n\nthe server thread suspended, and no later client is served.\n\n\n\nReject `nx_packet_length \u003e 4 + NX_TFTP_FILE_TRANSFER_MAX` in the DATA branch before either call,\n\n\n\nand use a bounded wait rather than NX_WAIT_FOREVER for the copy.",
  "id": "GHSA-fhxv-gc8j-2f6h",
  "modified": "2026-09-29T18:32:00Z",
  "published": "2026-09-29T18:32:00Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-wr79-332c-ff8f"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-102713"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/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"
    }
  ]
}

CVE-2026-102713 (GCVE-0-2026-102713)

Vulnerability from cvelistv5 – Published: 2026-09-29 17:40 – Updated: 2026-09-29 18:44

Summary

The TFTP server accepts a DATA datagram of any size. The dispatcher rejects datagrams shorter than four bytes (nxd_tftp_server.c:1037) and nothing anywhere checks an upper bound, in particular not against the protocol maximum of 4 + NX_TFTP_FILE_TRANSFER_MAX. Two things follow from that one missing check, both reachable before any authentication because TFTP has none. The handler passes `nx_packet_length - 4` straight to FileX: ```c /* addons/tftp/nxd_tftp_server.c:1863, 1889 */ status = nx_packet_copy(packet_ptr, &temp_ptr, server_ptr -> nx_tftp_server_packet_pool_ptr, NX_WAIT_FOREVER); ... fx_file_write(&(client_request_ptr -> nx_tftp_client_request_file), packet_ptr -> nx_packet_prepend_ptr + 4, packet_ptr -> nx_packet_length - 4); ``` `nx_packet_length` is the length of a chain, not of one contiguous buffer, so FileX copies past the end of the first packet: ``` ERROR: AddressSanitizer: heap-buffer-overflow READ of size 1280 at 0x621000001108 thread T5 #0 __interceptor_memcpy #1 _fx_utility_memory_copy filex/common/src/fx_utility_memory_copy.c:78 0x621000001108 is 0 bytes to the right of 4104-byte region ``` Those bytes are written into the file the attacker is uploading, and a TFTP read request hands them back, so this is a memory disclosure with a convenient retrieval channel. The same datagram also wedges the server. `nx_packet_copy` at :1863 needs ceil(nx_packet_length / pool_payload) packets and asks for them with NX_WAIT_FOREVER, so when the attacker sizes the datagram beyond what the pool holds, the server thread suspends and never returns. A liveness probe after one such datagram times out with the pool at 0 of 12 packets and the server thread suspended, and no later client is served. Reject `nx_packet_length > 4 + NX_TFTP_FILE_TRANSFER_MAX` in the DATA branch before either call, and use a bounded wait rather than NX_WAIT_FOREVER for the copy.

Severity

8.8 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/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 2026-09-29 18:44 UTC

CWE

CWE-125 - Out-of-bounds Read
CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

eclipse mitre root Scorecard

References

1 reference

URL	Tags
https://github.com/eclipse-threadx/netxduo/securi…

Impacted products

1 product

Vendor	Product	Version
Eclipse Foundation	NetX Duo	Affected: 0 , ≤ 6.5.1.202602 (semver)

Credits

L0stHeart

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-102713",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-29T18:44:12.259965Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-29T18:44:38.207Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageName": "NetX Duo",
          "product": "NetX Duo",
          "vendor": "Eclipse Foundation",
          "versions": [
            {
              "lessThanOrEqual": "6.5.1.202602",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "L0stHeart"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eThe TFTP server accepts a DATA datagram of any size. The dispatcher rejects datagrams shorter than\u003c/p\u003e\u003cp\u003efour bytes (nxd_tftp_server.c:1037) and nothing anywhere checks an upper bound, in particular not\u003c/p\u003e\u003cp\u003eagainst the protocol maximum of 4 + NX_TFTP_FILE_TRANSFER_MAX. Two things follow from that one\u003c/p\u003e\u003cp\u003emissing check, both reachable before any authentication because TFTP has none.\u003c/p\u003e\u003cp\u003eThe handler passes `nx_packet_length - 4` straight to FileX:\u003c/p\u003e\u003cp\u003e```c\u003c/p\u003e\u003cp\u003e/* addons/tftp/nxd_tftp_server.c:1863, 1889 */\u003c/p\u003e\u003cp\u003estatus = nx_packet_copy(packet_ptr, \u0026amp;temp_ptr,\u003c/p\u003e\u003ccode\u003e                        server_ptr -\u0026gt; nx_tftp_server_packet_pool_ptr, NX_WAIT_FOREVER);\u003c/code\u003e\u003cbr\u003e\u003cp\u003e...\u003c/p\u003e\u003cp\u003efx_file_write(\u0026amp;(client_request_ptr -\u0026gt; nx_tftp_client_request_file),\u003c/p\u003e\u003ccode\u003e              packet_ptr -\u0026gt; nx_packet_prepend_ptr + 4,\u003c/code\u003e\u003cbr\u003e\u003ccode\u003e              packet_ptr -\u0026gt; nx_packet_length - 4);\u003c/code\u003e\u003cbr\u003e\u003cp\u003e```\u003c/p\u003e\u003cp\u003e`nx_packet_length` is the length of a chain, not of one contiguous buffer, so FileX copies past the\u003c/p\u003e\u003cp\u003eend of the first packet:\u003c/p\u003e\u003cp\u003e```\u003c/p\u003e\u003cp\u003eERROR: AddressSanitizer: heap-buffer-overflow\u003c/p\u003e\u003cp\u003eREAD of size 1280 at 0x621000001108 thread T5\u003c/p\u003e\u003ccode\u003e    #0 __interceptor_memcpy\u003c/code\u003e\u003cbr\u003e\u003ccode\u003e    #1 _fx_utility_memory_copy  filex/common/src/fx_utility_memory_copy.c:78\u003c/code\u003e\u003cbr\u003e\u003cp\u003e0x621000001108 is 0 bytes to the right of 4104-byte region\u003c/p\u003e\u003cp\u003e```\u003c/p\u003e\u003cp\u003eThose bytes are written into the file the attacker is uploading, and a TFTP read request hands them\u003c/p\u003e\u003cp\u003eback, so this is a memory disclosure with a convenient retrieval channel.\u003c/p\u003e\u003cp\u003eThe same datagram also wedges the server. `nx_packet_copy` at :1863 needs\u003c/p\u003e\u003cp\u003eceil(nx_packet_length / pool_payload) packets and asks for them with NX_WAIT_FOREVER, so when the\u003c/p\u003e\u003cp\u003eattacker sizes the datagram beyond what the pool holds, the server thread suspends and never\u003c/p\u003e\u003cp\u003ereturns. A liveness probe after one such datagram times out with the pool at 0 of 12 packets and\u003c/p\u003e\u003cp\u003ethe server thread suspended, and no later client is served.\u003c/p\u003e\u003cp\u003eReject `nx_packet_length \u0026gt; 4 + NX_TFTP_FILE_TRANSFER_MAX` in the DATA branch before either call,\u003c/p\u003e\u003cp\u003eand use a bounded wait rather than NX_WAIT_FOREVER for the copy.\u003c/p\u003e"
            }
          ],
          "value": "The TFTP server accepts a DATA datagram of any size. The dispatcher rejects datagrams shorter than\n\n\n\nfour bytes (nxd_tftp_server.c:1037) and nothing anywhere checks an upper bound, in particular not\n\n\n\nagainst the protocol maximum of 4 + NX_TFTP_FILE_TRANSFER_MAX. Two things follow from that one\n\n\n\nmissing check, both reachable before any authentication because TFTP has none.\n\n\n\nThe handler passes `nx_packet_length - 4` straight to FileX:\n\n\n\n```c\n\n\n\n/* addons/tftp/nxd_tftp_server.c:1863, 1889 */\n\n\n\nstatus = nx_packet_copy(packet_ptr, \u0026temp_ptr,\n\n                        server_ptr -\u003e nx_tftp_server_packet_pool_ptr, NX_WAIT_FOREVER);\n\n\n...\n\n\n\nfx_file_write(\u0026(client_request_ptr -\u003e nx_tftp_client_request_file),\n\n              packet_ptr -\u003e nx_packet_prepend_ptr + 4,\n              packet_ptr -\u003e nx_packet_length - 4);\n\n\n```\n\n\n\n`nx_packet_length` is the length of a chain, not of one contiguous buffer, so FileX copies past the\n\n\n\nend of the first packet:\n\n\n\n```\n\n\n\nERROR: AddressSanitizer: heap-buffer-overflow\n\n\n\nREAD of size 1280 at 0x621000001108 thread T5\n\n    #0 __interceptor_memcpy\n    #1 _fx_utility_memory_copy  filex/common/src/fx_utility_memory_copy.c:78\n\n\n0x621000001108 is 0 bytes to the right of 4104-byte region\n\n\n\n```\n\n\n\nThose bytes are written into the file the attacker is uploading, and a TFTP read request hands them\n\n\n\nback, so this is a memory disclosure with a convenient retrieval channel.\n\n\n\nThe same datagram also wedges the server. `nx_packet_copy` at :1863 needs\n\n\n\nceil(nx_packet_length / pool_payload) packets and asks for them with NX_WAIT_FOREVER, so when the\n\n\n\nattacker sizes the datagram beyond what the pool holds, the server thread suspends and never\n\n\n\nreturns. A liveness probe after one such datagram times out with the pool at 0 of 12 packets and\n\n\n\nthe server thread suspended, and no later client is served.\n\n\n\nReject `nx_packet_length \u003e 4 + NX_TFTP_FILE_TRANSFER_MAX` in the DATA branch before either call,\n\n\n\nand use a bounded wait rather than NX_WAIT_FOREVER for the copy."
        }
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      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "exploitMaturity": "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:H/VI:N/VA:H/SC:N/SI:N/SA:N",
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            "vulnAvailabilityImpact": "HIGH",
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            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
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      "problemTypes": [
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          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125 Out-of-bounds Read",
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              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770 Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-29T17:40:40.067Z",
        "orgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c",
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      },
      "references": [
        {
          "url": "https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-wr79-332c-ff8f"
        }
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      "source": {
        "discovery": "UNKNOWN"
      },
      "x_generator": {
        "engine": "Vulnogram 1.0.5"
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  "cveMetadata": {
    "assignerOrgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c",
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    "datePublished": "2026-09-29T17:40:40.067Z",
    "dateReserved": "2026-09-29T16:15:09.632Z",
    "dateUpdated": "2026-09-29T18:44:38.207Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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}

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.

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Action not permitted

GHSA-FHXV-GC8J-2F6H

CVE-2026-102713 (GCVE-0-2026-102713)

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