CVE-2026-27751: Sodola SL902-SWTGW124AS Auth Bypass Issue

CVE-2026-27751 Overview

CVE-2026-27751 is a critical default credentials vulnerability affecting SODOLA SL902-SWTGW124AS network switch firmware versions through 200.1.20. This vulnerability allows remote attackers to obtain administrative access to the device management interface by authenticating with hardcoded default credentials. The device fails to enforce password change requirements, enabling attackers to gain full administrative control over the affected network switch.

Critical Impact

Remote attackers can gain complete administrative control of SODOLA network switches using default credentials, potentially compromising network infrastructure, enabling lateral movement, and facilitating man-in-the-middle attacks.

Affected Products

• SODOLA SL902-SWTGW124AS Firmware (versions through 200.1.20)
• SODOLA SL902-SWTGW124AS Hardware Device
• SODOLA 6-Port 2.5G Easy Web Managed Switch

Discovery Timeline

• 2026-02-27 - CVE-2026-27751 published to NVD
• 2026-03-04 - Last updated in NVD database

Technical Details for CVE-2026-27751

Vulnerability Analysis

This vulnerability falls under CWE-1392 (Use of Default Credentials), a configuration and design flaw that represents a serious security risk in network infrastructure devices. The SODOLA SL902-SWTGW124AS network switch ships with hardcoded default credentials that provide administrative access to the device's web management interface. The firmware lacks any enforcement mechanism to require users to change these default credentials upon initial setup or first login.

The network-accessible nature of this vulnerability is particularly concerning as it requires no user interaction and can be exploited by unauthenticated remote attackers. Once an attacker gains administrative access, they can modify switch configurations, intercept network traffic, create persistent backdoors, or use the compromised device as a pivot point for further network attacks.

Root Cause

The root cause of this vulnerability is the use of hardcoded default credentials in the device firmware combined with the absence of forced password change mechanisms during initial device setup. The firmware through version 200.1.20 does not implement security controls that would require administrators to establish unique credentials before the device becomes operational on the network.

Attack Vector

The attack vector for CVE-2026-27751 is network-based and requires no authentication or special privileges. An attacker with network access to the management interface of a vulnerable SODOLA SL902-SWTGW124AS device can attempt authentication using commonly known default credential combinations.

The exploitation process involves identifying exposed management interfaces through network scanning, then attempting authentication with default credentials. Once authenticated, the attacker obtains full administrative privileges over the switch, including the ability to modify VLAN configurations, alter QoS settings, change port configurations, and potentially intercept or redirect network traffic.

For technical details on this vulnerability, refer to the VulnCheck Advisory on Default Credentials.

Detection Methods for CVE-2026-27751

Indicators of Compromise

• Unexpected successful authentication attempts to switch management interfaces from unknown IP addresses
• Configuration changes made outside of normal administrative windows or by unrecognized administrator accounts
• Network traffic patterns indicating unauthorized access to the switch management interface (typically HTTP/HTTPS on standard ports)
• Audit logs showing multiple successful logins using default administrator accounts

Detection Strategies

• Monitor network traffic for authentication attempts to SODOLA switch management interfaces from unauthorized networks or IP ranges
• Implement network segmentation rules and generate alerts when management interface access is attempted from outside designated management VLANs
• Deploy network-based intrusion detection signatures to identify default credential authentication patterns
• Conduct regular credential audits to identify devices still configured with default credentials

Monitoring Recommendations

• Enable and centralize logging for all network infrastructure device authentication events
• Configure SIEM rules to alert on successful authentications to network switch management interfaces from unexpected source addresses
• Establish baseline administrative access patterns and alert on deviations
• Implement honeypot credentials on network devices to detect credential stuffing attacks

How to Mitigate CVE-2026-27751

Immediate Actions Required

• Immediately change default credentials on all SODOLA SL902-SWTGW124AS devices to strong, unique passwords
• Restrict management interface access to dedicated management networks or VLANs only
• Disable remote management access over untrusted networks; consider disabling web management interface if not required
• Conduct an inventory audit to identify all SODOLA SL902-SWTGW124AS devices in the environment

Patch Information

At the time of publication, no vendor patch has been identified for this vulnerability. Administrators should monitor the Sodola Network Product Page for firmware updates that address this issue. Applying the immediate mitigations above is essential until a vendor fix becomes available.

Workarounds

• Implement network access control lists (ACLs) to restrict management interface access to authorized administrator IP addresses only
• Place switch management interfaces on isolated management VLANs that are not accessible from general user networks
• Consider implementing a jump host or bastion server architecture for all network device administration
• If the management interface is not required, disable it entirely through console access

# Example network segmentation configuration (generic)
# Restrict management interface access to management VLAN only
# Configure on upstream firewall or router

# Allow management access only from admin subnet
iptables -A INPUT -p tcp --dport 80 -s 10.10.10.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 10.10.10.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP