CVE-2026-82702: Edimax BR-6214K Router RCE Vulnerability

CVE-2026-82702 Overview

CVE-2026-82702 is an operating system command injection vulnerability in the Edimax BR-6214K router running firmware version 1.40. The flaw resides in the system function within the www/wlanMP.asp file, part of the asp_WlanMP endpoint component. Attackers can manipulate the ateFunc argument to inject arbitrary operating system commands. The vulnerability is remotely reachable and requires high privileges according to the CVSS 4.0 vector. Public exploit details have been released, and the vendor did not respond to disclosure attempts, leaving the issue unpatched. The weakness is classified under CWE-77: Improper Neutralization of Special Elements used in a Command.

Critical Impact
Authenticated remote attackers can execute arbitrary OS commands on affected Edimax BR-6214K 1.40 devices through the ateFunc parameter, with no vendor patch available.

Affected Products

Edimax BR-6214K router, firmware version 1.40
Component: asp_WlanMP endpoint (www/wlanMP.asp)
Vulnerable function: system invoked with attacker-controlled ateFunc argument

Discovery Timeline

2026-08-31 - CVE-2026-82702 published to the National Vulnerability Database (NVD)
2026-08-31 - Last updated in NVD database

Technical Details for CVE-2026-82702

Vulnerability Analysis

The Edimax BR-6214K exposes an administrative interface page at www/wlanMP.asp handled by the asp_WlanMP endpoint. This endpoint accepts an ateFunc parameter and forwards its value into a call to the system function without sanitization. Because the input is passed directly to a shell interpreter, attackers can append shell metacharacters and secondary commands. Successful exploitation yields arbitrary command execution in the context of the web management process, which on consumer routers typically runs with elevated privileges.

Root Cause

The root cause is improper neutralization of special elements used in an OS command [CWE-77]. The ateFunc argument is concatenated into a command string and dispatched through system() without input validation, allow-listing, or shell escaping. Any shell separator such as ;, &&, |, or backticks enables the attacker to break out of the intended command and execute additional payloads.

Attack Vector

The attack vector is network-based and targets the router's HTTP management interface. According to the CVSS 4.0 vector, exploitation requires high privileges, meaning the attacker must first authenticate to the web interface. Once authenticated, the attacker issues a crafted HTTP request to wlanMP.asp with a malicious ateFunc value. Public technical details for this issue are documented in the GitHub command injection research writeup and the VulDB CVE-2026-82702 listing.

No verified proof-of-concept code is included here. See the referenced advisories for exploitation specifics.

Detection Methods for CVE-2026-82702

Indicators of Compromise

HTTP requests to /wlanMP.asp containing shell metacharacters (;, |, &, backticks, $()) within the ateFunc parameter
Unexpected outbound connections originating from the router to unknown hosts following management-interface activity
Modified router configuration, new user accounts, or altered firewall/NAT rules that were not initiated by administrators

Detection Strategies

Inspect web server access logs on the router (where available) for wlanMP.asp requests carrying non-alphanumeric characters in ateFunc
Deploy network-based intrusion detection signatures that flag command-injection payload patterns in HTTP request bodies and query strings directed at the router's management interface
Correlate authentication events on the router with subsequent unusual process or network activity to identify post-authentication abuse

Monitoring Recommendations

Restrict router management access to a dedicated management VLAN and monitor that segment for anomalous HTTP traffic
Alert on any administrative session originating from unexpected source addresses or geolocations
Track DNS queries and outbound flows from the router itself, since routers rarely initiate application-layer traffic under normal operation

How to Mitigate CVE-2026-82702

Immediate Actions Required

Disable remote (WAN-side) administration on the Edimax BR-6214K and restrict LAN-side management to trusted hosts
Rotate the administrator password and remove any unused accounts to reduce the pool of credentials that could satisfy the high-privilege prerequisite
Place the device behind a network segment that blocks untrusted clients from reaching wlanMP.asp and the wider management interface

Patch Information

No vendor patch is available. The advisory states that Edimax was contacted about this disclosure but did not respond. Organizations still operating the BR-6214K on firmware 1.40 should evaluate replacement with a supported device, because the vendor has not committed to remediation. Monitor the Edimax support portal for any future firmware updates that may address this issue.

Workarounds

Isolate affected routers on a segmented network and deny inbound HTTP/HTTPS traffic to the management interface from untrusted sources
Enforce strong, unique administrator credentials and enable account lockout where supported to reduce the risk of credential-based access
Where feasible, replace the BR-6214K with a currently supported router that receives security updates
Log and alert on all administrative access to the device and review sessions for suspicious ateFunc parameter values

bash

# Example: firewall rule to restrict router management access to a single admin host
iptables -A INPUT -p tcp --dport 80 -s 192.0.2.10 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -s 192.0.2.10 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP