CVE-2026-102721
MediumCVSS 6.9Summary
A TFTP server that answers with a short ERROR packet makes the client read up to 64 bytes past the received datagram. The loop copying the error message does not compare the pointer against the end of the packet, leading to a heap-buffer-overflow.
Risk Assessment
A malicious TFTP server can trigger an out-of-bounds read, exposing adjacent packet pool memory that may be logged or displayed. This may lead to information disclosure or client crash.
Recommendation
Update the NetX TFTP library to a version with the fix adding `(buffer_ptr < packet_ptr->nx_packet_append_ptr)` to the loop condition in all three paths. Until patched, avoid connecting to untrusted TFTP servers.
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Original NVD description (English source)
A TFTP server that answers with a short ERROR packet makes the client read up to 64 bytes past the received datagram. Each receive path checks only that the datagram is at least four bytes long (nxd_tftp_client.c:1229, 1521, 1984). When the opcode is NX_TFTP_CODE_ERROR the message string is copied with a loop whose only limits are the destination buffer and a NUL byte: ```c /* addons/tftp/nxd_tftp_client.c:1769 */ for (i = 0; (i < (sizeof(tftp_client_ptr -> nx_tftp_client_error_string) - 1)) && (*buffer_ptr); i++) ``` Nothing compares `buffer_ptr` against `nx_packet_append_ptr`. An ERROR packet that carries no terminating NUL, which a server controls completely, walks the loop off the end of the packet until it happens to meet a zero byte or fills the 64 byte destination. ``` ERROR: AddressSanitizer: heap-buffer-overflow READ of size 1 at 0x60d0000000c8 thread T4 #0 _nxd_tftp_client_file_read addons/tftp/nxd_tftp_client.c:1769 0x60d0000000c8 is 0 bytes to the right of 136-byte region ``` The open path has the same loop at :1327 and reports the same way. What is read lands in `nx_tftp_client_error_string`, which the application is expected to display or log, so adjacent packet pool memory ends up in whatever the device does with the error text. Add `(buffer_ptr < packet_ptr -> nx_packet_append_ptr)` to the loop condition in all three paths.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS