CVE-2026-76870

Netcore NR255-V 1.5.130703 Out-of-Bounds Read in mtd_write Firmware Upload Validation

State: Published
Severity: 7.1 High
Published: Sep 15, 2026
Updated: Sep 16, 2026
Reserved: Aug 19, 2026

Description

Netcore NR255-V version 1.5.130703 contains an out-of-bounds read vulnerability in the mtd_write pre-flash validation routine triggered by short firmware uploads. Attackers can upload a truncated firmware image via put_file_cgi.c to trigger out-of-bounds reads across main.c, check_image_uuid.c, and oemMD5Update.c.

Scores

CVSS	Score	Vector	Source
4.0	7.1 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	7.1 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H	VulnCheck

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
NR255-VNetcore	1.5.130703Affected

References

Netcore router public references: Out-of-bounds Reads in mtd_write Pre-flash Validation via Short Firmware Uploadthird-party-advisory
VulnCheck Advisory: Netcore NR255-V 1.5.130703 Out-of-Bounds Read in mtd_write Firmware Upload Validationthird-party-advisory

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