CVE-2026-22613: Eaton Network M3 Auth Bypass Vulnerability

CVE-2026-22613 Overview

CVE-2026-22613 is a certificate validation bypass vulnerability affecting Eaton Network M3 devices. The server identity check mechanism for firmware upgrade operations performed via the command shell is insecurely implemented, potentially allowing an attacker to perform a Man-in-the-Middle (MITM) attack. This vulnerability is classified under CWE-295 (Improper Certificate Validation).

Critical Impact
Attackers with network access and elevated privileges could intercept firmware upgrade communications, potentially injecting malicious firmware or capturing sensitive authentication data during the upgrade process.

Affected Products

Eaton Network M3 (versions prior to the latest security update)

Discovery Timeline

2026-02-09 - CVE-2026-22613 published to NVD
2026-02-09 - Last updated in NVD database

Technical Details for CVE-2026-22613

Vulnerability Analysis

This vulnerability stems from improper implementation of server identity verification during the firmware upgrade process. When firmware upgrades are initiated via the command shell interface, the device fails to properly validate the authenticity of the upgrade server's SSL/TLS certificate. This improper certificate validation creates an opportunity for attackers positioned on the network path to intercept and manipulate the communication channel between the Eaton Network M3 device and the legitimate firmware server.

The attack requires network-level access and high privileges to execute, along with user interaction. Despite these prerequisites, successful exploitation could result in high confidentiality impact with limited integrity and availability consequences.

Root Cause

The root cause is an improper certificate validation implementation (CWE-295) in the firmware upgrade mechanism. The command shell interface does not perform adequate checks on the server's certificate chain, hostname verification, or certificate revocation status when establishing a secure connection to the firmware update server.

Attack Vector

The vulnerability is exploitable over the network. An attacker must be positioned to intercept traffic between the Eaton Network M3 device and the firmware update server—typically achieved through ARP spoofing, DNS hijacking, or compromised network infrastructure. When a privileged user initiates a firmware upgrade via the command shell, the attacker can present a fraudulent server certificate. Due to the improper validation, the device accepts this certificate, allowing the attacker to:

Intercept credentials and sensitive data transmitted during the upgrade
Potentially inject malicious firmware images
Downgrade the device to vulnerable firmware versions

The exploitation mechanism involves intercepting the TLS handshake and presenting a self-signed or attacker-controlled certificate to the vulnerable device. For detailed technical information, refer to the Eaton Security Bulletin ETN-VA-2025-1002.

Detection Methods for CVE-2026-22613

Indicators of Compromise

Unexpected firmware version changes on Eaton Network M3 devices
SSL/TLS certificate warnings or anomalies in device logs during firmware upgrade attempts
Network traffic showing firmware downloads from unauthorized IP addresses or domains
ARP table anomalies or unexpected MAC address mappings on the network segment

Detection Strategies

Monitor network traffic for firmware upgrade connections to non-Eaton domains or IP addresses
Implement network intrusion detection rules to identify potential MITM attacks targeting firmware upgrade traffic
Review command shell access logs for firmware upgrade commands, correlating with network traffic analysis
Deploy certificate transparency monitoring to detect unauthorized certificates presented during upgrade operations

Monitoring Recommendations

Enable verbose logging on Eaton Network M3 devices during firmware upgrade operations
Implement network segmentation to isolate critical infrastructure devices and monitor cross-segment traffic
Use network monitoring tools to baseline normal firmware upgrade traffic patterns and alert on deviations
Regularly audit firmware versions across all Eaton Network M3 devices to detect unauthorized changes

How to Mitigate CVE-2026-22613

Immediate Actions Required

Update Eaton Network M3 devices to the latest firmware version available from the Eaton download center
Restrict command shell access to only authorized administrators
Isolate Eaton Network M3 devices on a dedicated network segment with strict access controls
Avoid performing firmware upgrades over untrusted networks

Patch Information

Eaton has released an updated firmware version that addresses this vulnerability. The fix is available on the official Eaton download center. Administrators should verify firmware authenticity using the checksums provided by Eaton before applying updates. Refer to the Eaton Security Bulletin ETN-VA-2025-1002 for specific version information and update instructions.

Workarounds

Download firmware updates on a secure system and transfer them to devices via local/offline methods when possible
Implement network-level protections such as VPN tunnels or dedicated management networks for firmware upgrades
Use network monitoring to detect and block potential MITM attacks during firmware operations
Restrict physical and network access to systems where firmware upgrades are performed

bash

# Example network segmentation configuration for firmware upgrade isolation
# Create dedicated VLAN for device management
# Restrict firmware upgrade traffic to known Eaton servers
# Enable logging for all firmware upgrade operations