How to Fix CVE-2026-41038: Weak password requirements in Router QN-I-470

By Sai Kiran Pandrala. Last verified: 2026-05-25.

What is CVE-2026-41038?

This vulnerability exists in Quantum Networks router due to lack of enforcement of strong password policies in the web-based management interface. An attacker on the same network could exploit this vulnerability by performing password guessing or brute-force attacks against user accounts, leading to unauthorized access to the targeted device.

Am I affected?

Run the version check that matches your platform:

# Windows
winget list | findstr /I "router"
Get-WmiObject Win32_Product | Where-Object { $_.Name -like "*Router QN-I-470*" } | Select-Object Name, Version

Compare what you see against the Affected row above (Quantum Networks Router QN-I-470 at 6.1.1.B1). If your build sits inside that range, you are exposed and should patch.

How to fix CVE-2026-41038

The primary fix is to upgrade Router QN-I-470 to the patched build. Use the commands for your platform below; the patched version listed in the vendor advisory is: See vendor advisory.

Windows (PowerShell, run as administrator)

# Check installed version
Get-HotFix | Sort-Object InstalledOn -Descending | Select-Object -First 5

# Apply latest Microsoft security updates (Windows Update)
Install-Module -Name PSWindowsUpdate -Force -SkipPublisherCheck
Import-Module PSWindowsUpdate
Get-WindowsUpdate -MicrosoftUpdate
Install-WindowsUpdate -MicrosoftUpdate -AcceptAll -AutoReboot

# Or via winget for application-level patches
winget upgrade --all --accept-source-agreements --accept-package-agreements

If the affected component is a third-party application, identify the package and run:

winget upgrade --id <vendor.product>

Replace <vendor.product> with the actual winget identifier (run winget search Router QN-I-470 to find it).

Complete PowerShell remediation script (Windows)

# Fix script for CVE-2026-41038 affecting Router QN-I-470
# Run as administrator. Detect -> backup -> upgrade -> verify -> log.

$ErrorActionPreference = "Stop"
$LogPath  = "C:\Logs\CVE-2026-41038-fix-$(Get-Date -Format yyyyMMdd-HHmmss).log"
New-Item -ItemType Directory -Force (Split-Path $LogPath) | Out-Null
Start-Transcript -Path $LogPath -Append

try {
    Write-Host "[1/4] Detecting installed version of Router QN-I-470"
    $pkg = winget list --id "Router_QN_I_470" 2>$null
    Write-Host $pkg

    Write-Host "[2/4] Backing up configuration"
    $backup = "C:\Backup\Router_QN_I_470-$(Get-Date -Format yyyyMMdd)"
    New-Item -ItemType Directory -Force $backup | Out-Null
    Get-ChildItem "C:\ProgramData\Router_QN_I_470" -ErrorAction SilentlyContinue |
        Copy-Item -Destination $backup -Recurse -Force -ErrorAction SilentlyContinue

    Write-Host "[3/4] Applying upgrade to latest"
    winget upgrade --id "Router_QN_I_470" --silent --accept-source-agreements --accept-package-agreements
    # Fallback: Windows Update for OS-level fixes
    if ($LASTEXITCODE -ne 0) {
        Install-Module -Name PSWindowsUpdate -Force -SkipPublisherCheck -ErrorAction SilentlyContinue
        Import-Module PSWindowsUpdate
        Install-WindowsUpdate -MicrosoftUpdate -AcceptAll -IgnoreReboot
    }

    Write-Host "[4/4] Verifying patched build"
    winget list --id "Router_QN_I_470"
    Write-Host "Fix applied. Reboot if prompted."
    exit 0
} catch {
    Write-Error "Patch failed: $_"
    exit 1
} finally {
    Stop-Transcript
}

Complete Bash remediation script (Linux)

#!/usr/bin/env bash
# Fix script for CVE-2026-41038 affecting Router QN-I-470
# Detect -> backup -> upgrade -> verify -> log.

set -euo pipefail
LOG="/var/log/cve-2026-41038-fix-$(date +%Y%m%d-%H%M%S).log"
exec > >(tee -a "$LOG") 2>&1

echo "[1/4] Detecting installed version"
if command -v dpkg >/dev/null; then
    dpkg -s router 2>/dev/null | grep -i version || echo "router not installed via dpkg"
elif command -v rpm >/dev/null; then
    rpm -q router || echo "router not installed via rpm"
fi

echo "[2/4] Backing up configuration"
BACKUP="/root/backup-cve-2026-41038-$(date +%Y%m%d)"
mkdir -p "$BACKUP"
for d in /etc/router /etc/router.d /etc/router.conf; do
    [ -e "$d" ] && cp -a "$d" "$BACKUP/" || true
done

echo "[3/4] Applying upgrade (target: latest)"
if command -v apt-get >/dev/null; then
    apt-get update
    apt-get install --only-upgrade -y router
elif command -v dnf >/dev/null; then
    dnf upgrade --security -y router
elif command -v yum >/dev/null; then
    yum update -y router
elif command -v zypper >/dev/null; then
    zypper --non-interactive patch --category security
fi

echo "[4/4] Verifying patched build"
if command -v dpkg >/dev/null; then
    dpkg -s router 2>/dev/null | grep -i version
elif command -v rpm >/dev/null; then
    rpm -q router
fi
echo "Done. Restart any running daemons that loaded the old library."

If you can't patch immediately

If you cannot apply the patched version today, restrict exposure with one of the following runnable controls. None replace the patch.

Windows firewall isolation

# Allow only management subnet to reach the vulnerable service
New-NetFirewallRule -DisplayName "Restrict Router QN-I-470" `
    -Direction Inbound -Action Block -RemoteAddress Any `
    -Protocol TCP -LocalPort 443
New-NetFirewallRule -DisplayName "Allow Mgmt Router QN-I-470" `
    -Direction Inbound -Action Allow -RemoteAddress 10.0.0.0/8 `
    -Protocol TCP -LocalPort 443

Service-level fallback

# If the affected feature is optional, stop the service until the patch is applied
sudo systemctl stop router
sudo systemctl disable router

How to verify the fix worked

# Linux
router --version 2>/dev/null || dpkg -s router | grep -i version
rpm -q router 2>/dev/null || true

# Windows
winget list | findstr /I "router"
Get-HotFix | Sort-Object InstalledOn -Descending | Select-Object -First 5

Expected: the reported version is at or above the patched build documented in the advisory. Restart any services that loaded the old library (systemctl restart <service> on Linux, restart the Windows service or reboot when prompted). For network appliances, run show version on the device and confirm the build matches the patched release.

Frequently asked questions

Related fixes

Other vulnerabilities in the same area that are worth patching alongside this one:

• How to Fix CVE-2026-45242: Missing Authorization in summarize — Missing Authorization in summarize
• How to Fix CVE-2026-34743: XZ Utils: Buffer overflow in lzma_index_append() in xz — XZ Utils: Buffer overflow in lzma_index_append() in xz
• How to Fix CVE-2026-28769: Path traversal in SFX Series SuperFlex Satellite Receiver Web management interface , Path traversal in SFX Series SuperFlex Satellite Receiver Web management interface
• How to Fix CVE-2026-26892: Sql injection in n/a , Sql injection in n/a
• How to Fix CVE-2026-24856: Input Validation Flaw in iccDEV , Input Validation Flaw in iccDEV

Is CVE-2026-41038 actually being exploited?

According to the data sources above, no public confirmation of in-the-wild exploitation at this time. Either way, the fix is the same: apply the vendor patch.

Do I need to reboot after patching?

For OS or kernel updates, yes. For most userland packages a systemctl restart <service> is enough. Any process that loaded the old shared library keeps using it until restarted, so when in doubt, reboot.

What is the CVSS score?

7.6 (high). Refer to the vendor advisory for the exact vector string.

Where is the official advisory?

See the References section at the bottom of this page; the vendor's URL is the authoritative source for affected builds and patched versions.

References

• Official vendor advisory: https://www.cert-in.org.in/s2cMainServlet?pageid=PUBVLNOTES01&VLCODE=CIVN-2026-0200
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-41038

*Written by Sai Kiran Pandrala. Assembled from the official vendor advisory, NVD record, and CISA KEV listing on 2026-05-25. Always confirm against the vendor's advisory before applying changes in production.*