CVE-2026-71263
9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Summary
The LINUXTCP port of FreeModbus contains an off-by-one bounds check in xMBPortTCPPool (demo/LINUXTCP/port/porttcp.c). The check uses a strict greater-than comparison instead of greater-than-or-equal against the 263-byte MB_TCP_BUF_SIZE limit.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| cwalter-at | FreeModbus | 0 <= * | affected |
Weaknesses
- CWE-787: CWE-787
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: yes
- Technical Impact: partial
References
- https://github.com/cwalter-at/freemodbus
- https://github.com/cwalter-at/freemodbus/blob/master/demo/LINUXTCP/port/porttcp.c
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