CVE-2026-76852

EUVD-2026-80055 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

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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)

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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

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Exploit and PoC references, threat intelligence from 22 sources

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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.