---
id: CVE-2026-76852
title: >-
  Netcore NR268 firmware version 1.7.121109 has an improper integrity
  verification flaw in mtd_write allowing forged firmware authenticity checks
summary: >-
  Netcore NR268 firmware version 1.7.121109 has an improper integrity
  verification flaw in mtd_write allowing forged firmware authenticity checks.
  Attackers can exploit put_file.cgi and check_image_uuid.c to bypass firmware
  signature valid…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-354
vendor: Netcore
product: NR268
affected:
  - NR268 1.7.121109
published: '2026-09-15'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:16:47.237'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-76852'
references:
  - url: >-
      https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr268-firmware-forgery.md
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/netcore-nr268-1.7.121109-forgeable-firmware-authenticity-check-in-mtd-write
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-17T16:52:01.661088Z'
epss: 0.00231
epssPercentile: 0.14173
ingestedAt: '2026-09-15T22:45:31.285Z'
---

## Overview

Netcore NR268 firmware version 1.7.121109 has an improper integrity verification flaw in mtd_write allowing forged firmware authenticity checks. Attackers can exploit put_file.cgi and check_image_uuid.c to bypass firmware signature validation and load unauthorized firmware images.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.