CVE-2026-76870

HIGHCVSS 7.1

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.

Timeline

Published:September 15th, 2026 10:17 PM

Last modified:September 16th, 2026 8:17 PM

CVSS Scoring

CVSS v3: 7.1 (HIGH)

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H

Weaknesses (CWE)

CWE-125

References & Reports

Advisories, patches, and third-party reports

https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr255v-firmware-upload-oob.md
https://www.vulncheck.com/advisories/netcore-nr255-v-1.5.130703-out-of-bounds-read-in-mtd-write-firmware-upload-validation

Source: NIST NVD · Data may lag official sources by up to one minute