{"schemaVersion":3,"id":"CVE-2026-102721","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"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.","dates":{"published":"2026-09-29T17:47:12.769Z","modified":"2026-09-29T18:36:05.599Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.9,"severity":"medium","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"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","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":6.9,"severity":"medium","vector":"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","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":6.9,"severity":"medium","vector":"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/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","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00253,"percentile":0.15735,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-09-30T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00253,"percentile":0.15735}],"last30":[{"date":"2026-09-30T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00253,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00253,"percentile":0.15735}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-125","name":"Out-of-bounds Read","description":"The product reads data past the end, or before the beginning, of the intended buffer.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/125.html"}],"affected":[{"vendor":"eclipse foundation","product":"netx duo","name":"NetX Duo","label":"netx duo","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 6.5.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 6.5.1","eol":null,"hubHref":"/vendor/eclipse_foundation/netx_duo"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-wvc9-5m9h-rvxc","label":"github.com/eclipse-threadx/netxduo/security/advisories/GHSA-wvc9-5m9h-rvxc","hostname":"github.com","tags":[]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-09-29T17:47:12.769Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-29T18:36:05.599Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":28,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T05:08:34.389Z","stale":false,"partial":false}}