CVE-2026-2248: METIS WIC Devices RCE Vulnerability

CVE-2026-2248 Overview

CVE-2026-2248 is a critical Authentication Bypass vulnerability affecting METIS WIC devices running firmware versions oscore 2.1.234-r18 and earlier. The vulnerability exists in the web-based shell functionality exposed at the /console endpoint, which lacks any authentication mechanism. This allows remote attackers to execute arbitrary operating system commands with root (UID 0) privileges without requiring any credentials.

Critical Impact

Remote attackers can achieve full system compromise with root-level access, enabling unauthorized modification of system configuration, extraction of sensitive data, and complete disruption of device operations.

Affected Products

• METIS WIC devices running oscore versions <= 2.1.234-r18
• Devices with the /console web endpoint exposed to network access

Discovery Timeline

• 2026-02-11 - CVE CVE-2026-2248 published to NVD
• 2026-02-12 - Last updated in NVD database

Technical Details for CVE-2026-2248

Vulnerability Analysis

This vulnerability represents a severe authentication bypass flaw (CWE-287: Improper Authentication) in the METIS WIC device firmware. The /console endpoint implements a web-based shell interface that was likely intended for administrative or debugging purposes but was deployed without implementing any form of access control or authentication mechanism.

The absence of authentication on this endpoint means that any network-accessible attacker can interact with the shell interface directly. Commands submitted through this interface are executed with root privileges (UID 0), providing the attacker with the highest level of system access possible. This architectural flaw allows for complete device takeover in a single step, without requiring any credential theft, privilege escalation, or exploitation chain.

Root Cause

The root cause of CVE-2026-2248 is the complete absence of authentication controls on the /console endpoint. The web server handling requests to this endpoint does not validate user identity, session tokens, API keys, or any other form of authentication before processing shell commands. This represents a failure to implement basic access control principles during the device firmware development lifecycle.

Attack Vector

The attack vector is network-based and requires no user interaction or prior authentication. An attacker with network access to the vulnerable METIS WIC device can simply navigate to the /console endpoint and begin executing arbitrary commands. The attack workflow is straightforward:

1. Attacker identifies a network-accessible METIS WIC device
2. Attacker accesses the /console endpoint via HTTP
3. Attacker submits arbitrary shell commands through the web interface
4. Commands execute with root privileges, returning output to the attacker

The vulnerability is particularly severe in scenarios where METIS WIC devices are exposed to the internet or accessible from untrusted network segments. For additional technical details, see the Cydome Vulnerability Advisory.

Detection Methods for CVE-2026-2248

Indicators of Compromise

• HTTP requests targeting the /console endpoint from external or unauthorized IP addresses
• Unusual command execution patterns or processes spawned by the web server process
• Unexpected modifications to system configuration files or user accounts
• Network connections initiated by the device to unfamiliar external hosts

Detection Strategies

• Monitor web server access logs for requests to the /console endpoint
• Implement network intrusion detection rules to alert on /console access attempts
• Deploy endpoint detection solutions to identify anomalous root-level process execution
• Audit device configurations for unauthorized changes indicating post-exploitation activity

Monitoring Recommendations

• Enable comprehensive logging on METIS WIC devices and forward logs to a centralized SIEM
• Establish baseline network behavior for WIC devices and alert on deviations
• Monitor for lateral movement attempts originating from METIS WIC device IP addresses
• Implement network segmentation monitoring to detect unauthorized cross-segment communication

How to Mitigate CVE-2026-2248

Immediate Actions Required

• Immediately restrict network access to METIS WIC devices using firewall rules or network segmentation
• Block external access to the /console endpoint at the network perimeter
• Audit devices for signs of compromise before and after applying mitigations
• Inventory all METIS WIC devices in your environment to ensure complete coverage

Patch Information

Consult the vendor for firmware updates that address CVE-2026-2248. Monitor the METIS Technology website for official security advisories and patched firmware releases. Devices should be updated to firmware versions newer than oscore 2.1.234-r18 once available.

Workarounds

• Isolate METIS WIC devices on a dedicated network segment with strict access controls
• Implement firewall rules to block all access to port 80/443 (or the specific port serving the /console endpoint) from untrusted networks
• Deploy a reverse proxy with authentication in front of device web interfaces as a compensating control
• Consider disabling the web interface entirely if operationally feasible until a patch is available

# Example: Block access to /console endpoint using iptables
# Apply on network firewall or device if accessible
iptables -A INPUT -p tcp --dport 80 -m string --string "/console" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "/console" --algo bm -j DROP