CVE-2026-54410

HIGH EPSS 41.3%
Published Jun 14, 20262w ago · Modified Jun 17, 20262w ago
7.8 CVSS 4.0
High
Find Similar
Published Jun 14, 2026 2w ago
Last Modified Jun 17, 2026 2w ago

Description

nanoMODBUS through v1.23.0 contains an off-by-one buffer overflow in the recv_msg_header() function of the Modbus/TCP server that allows remote unauthenticated attackers to write one attacker-controlled byte past the end of the 260-byte receive buffer by sending a crafted MBAP frame whose Length field is set to 255. The overflow corrupts the adjacent buffer-index field of the nanoMODBUS state structure, resulting in denial of service through invalid memory accesses and, on bare-metal and RTOS targets without memory protection, one-byte information disclosure and writes to unintended register addresses on the Write Multiple Registers (FC16) handler path.

CVSS Details

Base Score
7.8
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P/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:Y/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
41.3% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 2

CWE-193
CWE-787 Out-of-bounds Write Memory Safety

References 4

  • cwe.mitre.org https://cwe.mitre.org/data/definitions/193.html
  • cwe.mitre.org https://cwe.mitre.org/data/definitions/787.html
  • github.com https://github.com/debevv/nanoMODBUS
  • github.com https://github.com/debevv/nanoMODBUS/blob/v1.23.0/nanomodbus.c#L369

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.