CVE-2026-102721
Quick assessment
Affected
Eclipse Foundation NetX Duo
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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_C
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I. Basic Information for CVE-2026-102721
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Eclipse Foundation | NetX Duo | 0 ~ 6.5.1 | - |
|
II. Public POCs for CVE-2026-102721
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-102721 (1)
Same Patch Batch · Eclipse Foundation · 2026-09-29 · 27 CVEs total
| CVE-2026-102710 | 9.3 CRITICAL | CVE-2026-102710 |
| CVE-2026-102761 | 9.3 CRITICAL | CVE-2026-102761 |
| CVE-2026-102712 | 8.8 HIGH | CVE-2026-102712 |
| CVE-2026-102713 | 8.8 HIGH | CVE-2026-102713 |
| CVE-2026-102718 | 8.7 HIGH | CVE-2026-102718 |
| CVE-2026-102716 | 8.7 HIGH | CVE-2026-102716 |
| CVE-2026-102730 | 8.6 HIGH | CVE-2026-102730 |
| CVE-2026-102757 | 8.5 HIGH | CVE-2026-102757 |
| CVE-2026-102709 | 8.4 HIGH | CVE-2026-102709 |
| CVE-2026-102760 | 8.3 HIGH | CVE-2026-102760 |
| CVE-2026-102762 | 8.2 HIGH | CVE-2026-102762 |
| CVE-2026-102715 | 7.1 HIGH | mDNS string-cache lookup matches on slot size, so a peer name aliases a shorter one and th |
| CVE-2026-102714 | 7.1 HIGH | CVE-2026-102714 |
| CVE-2026-102722 | 6.9 MEDIUM | CVE-2026-102722 |
| CVE-2026-102759 | 6.3 MEDIUM | CVE-2026-102759 |
| CVE-2026-102719 | 6.3 MEDIUM | CVE-2026-102719 |
| CVE-2026-102727 | 6.0 MEDIUM | CVE-2026-102727 |
| CVE-2026-102723 | 6.0 MEDIUM | CVE-2026-102723 |
| CVE-2026-102724 | 6.0 MEDIUM | CVE-2026-102724 |
| CVE-2026-102725 | 6.0 MEDIUM | CVE-2026-102725 |
Showing top 20 of 27 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-102721
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