{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-102721","assignerOrgId":"e51fbebd-6053-4e49-959f-1b94eeb69a2c","state":"PUBLISHED","assignerShortName":"eclipse","dateReserved":"2026-09-29T16:15:17.020Z","datePublished":"2026-09-29T17:47:12.769Z","dateUpdated":"2026-09-29T18:36:05.599Z"},"containers":{"cna":{"providerMetadata":{"orgId":"e51fbebd-6053-4e49-959f-1b94eeb69a2c","shortName":"eclipse","dateUpdated":"2026-09-29T17:47:12.769Z"},"problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-125","description":"CWE-125 Out-of-bounds Read","type":"CWE"}]}],"affected":[{"vendor":"Eclipse Foundation","product":"NetX Duo","packageName":"NetX Duo","versions":[{"status":"affected","version":"0","lessThanOrEqual":"6.5.1","versionType":"semver"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"A TFTP server that answers with a short ERROR packet makes the client read up to 64 bytes past the\n\n\n\nreceived datagram.\n\n\n\nEach receive path checks only that the datagram is at least four bytes long (nxd_tftp_client.c:1229,\n\n\n\n1521, 1984). When the opcode is NX_TFTP_CODE_ERROR the message string is copied with a loop whose\n\n\n\nonly limits are the destination buffer and a NUL byte:\n\n\n\n```c\n\n\n\n/* addons/tftp/nxd_tftp_client.c:1769 */\n\n\n\nfor (i = 0; (i < (sizeof(tftp_client_ptr -> nx_tftp_client_error_string) - 1)) && (*buffer_ptr); i++)\n\n\n\n```\n\n\n\nNothing compares `buffer_ptr` against `nx_packet_append_ptr`. An ERROR packet that carries no\n\n\n\nterminating NUL, which a server controls completely, walks the loop off the end of the packet until\n\n\n\nit happens to meet a zero byte or fills the 64 byte destination.\n\n\n\n```\n\n\n\nERROR: AddressSanitizer: heap-buffer-overflow\n\n\n\nREAD of size 1 at 0x60d0000000c8 thread T4\n\n    #0 _nxd_tftp_client_file_read  addons/tftp/nxd_tftp_client.c:1769\n\n\n0x60d0000000c8 is 0 bytes to the right of 136-byte region\n\n\n\n```\n\n\n\nThe open path has the same loop at :1327 and reports the same way. What is read lands in\n\n\n\n`nx_tftp_client_error_string`, which the application is expected to display or log, so adjacent\n\n\n\npacket pool memory ends up in whatever the device does with the error text.\n\n\n\nAdd `(buffer_ptr < packet_ptr -> nx_packet_append_ptr)` to the loop condition in all three paths.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>A TFTP server that answers with a short ERROR packet makes the client read up to 64 bytes past the</p><p>received datagram.</p><p>Each receive path checks only that the datagram is at least four bytes long (nxd_tftp_client.c:1229,</p><p>1521, 1984). When the opcode is NX_TFTP_CODE_ERROR the message string is copied with a loop whose</p><p>only limits are the destination buffer and a NUL byte:</p><p>```c</p><p>/* addons/tftp/nxd_tftp_client.c:1769 */</p><p>for (i = 0; (i &lt; (sizeof(tftp_client_ptr -&gt; nx_tftp_client_error_string) - 1)) &amp;&amp; (*buffer_ptr); i++)</p><p>```</p><p>Nothing compares `buffer_ptr` against `nx_packet_append_ptr`. An ERROR packet that carries no</p><p>terminating NUL, which a server controls completely, walks the loop off the end of the packet until</p><p>it happens to meet a zero byte or fills the 64 byte destination.</p><p>```</p><p>ERROR: AddressSanitizer: heap-buffer-overflow</p><p>READ of size 1 at 0x60d0000000c8 thread T4</p><code>    #0 _nxd_tftp_client_file_read  addons/tftp/nxd_tftp_client.c:1769</code><br><p>0x60d0000000c8 is 0 bytes to the right of 136-byte region</p><p>```</p><p>The open path has the same loop at :1327 and reports the same way. What is read lands in</p><p>`nx_tftp_client_error_string`, which the application is expected to display or log, so adjacent</p><p>packet pool memory ends up in whatever the device does with the error text.</p><p>Add `(buffer_ptr &lt; packet_ptr -&gt; nx_packet_append_ptr)` to the loop condition in all three paths.</p>"}]}],"references":[{"url":"https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-wvc9-5m9h-rvxc"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"LOW","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"MEDIUM","baseScore":6.9,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N"}}],"credits":[{"lang":"en","value":"L0stHeart","type":"reporter"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-29T18:35:29.043788Z","id":"CVE-2026-102721","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-29T18:36:05.599Z"}}]}}