EUVD-2026-80055

| CVE-2026-76852 HIGH

Improper Validation of Integrity Check Value (CWE-354)

2026-09-15 disclosure@vulncheck.com

GHSA-6645-rfg8-rhrm

Authentication Bypass

8.7

CVSS 4.0 · Vendor: vulncheck

View

Vulnerability Assessment

Weakness

CWE

CWE-354

OWASP Top 10:2025

A08:2025 - Software or Data Integrity Failures

ASVS 5.0

V15 - Secure Coding and Architecture Integrity verification

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.2% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAIv1 – Sep 15, 2026

Netcore NR268 routers running firmware 1.7.121109 accept forged firmware images because the mtd_write flashing path does not properly validate the firmware authenticity check performed by check_image_uuid.c, allowing an attacker who can reach the upload endpoint (put_file.cgi) with low privileges to load unauthorized firmware. Successful exploitation gives an attacker full control over the device — high confidentiality, integrity and availability impact per the CVSS 4.0 vector (AV:N/AC:L/PR:L/UI:N) — and the malicious image persists across reboots. The flaw is not listed in CISA KEV and no public exploit code has been identified at time of analysis, though a public technical write-up of the forgery technique and a VulnCheck advisory are available.

Affected VersionsENISA

NR268 1.7.121109

Affected Packages

euvd nr268 no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Know when the next one hits your stack

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

Vendor (vulncheck) PRIMARY 8.7 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (vulncheck) · only source for this CVE.

CVSS VectorVendor: vulncheck

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

Low

User Interaction

None

Vulnerable system: Confidentiality

High

Vulnerable system: Integrity

High

Vulnerable system: Availability

High

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

DescriptionCVE.org

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.

Threat Intelligence Overview

EPSS Score

0.2%

Top 86% exploitable

Data Quality

5 sources

Confidence: Medium

EUVD

NVD

CVE.org

EPSS

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.2%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.