CVE-2026-29119: IDC SFX Series Auth Bypass Vulnerability

CVE-2026-29119 Overview

International Datacasting Corporation (IDC) SFX Series SuperFlex (SFX2100) Satellite Receiver contains hardcoded and insecure credentials for the admin account. This critical vulnerability (CWE-798) allows a remote unauthenticated attacker to leverage these undocumented credentials to access the satellite system directly via the Telnet service, leading to potential complete system compromise.

Critical Impact

Remote attackers can gain unauthorized administrative access to satellite receiver systems using hardcoded credentials, potentially compromising critical broadcast infrastructure and enabling lateral movement within satellite communication networks.

Affected Products

• International Datacasting Corporation (IDC) SFX Series SuperFlex SFX2100 Satellite Receiver

Discovery Timeline

• 2026-03-04 - CVE-2026-29119 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-29119

Vulnerability Analysis

This vulnerability represents a severe authentication weakness in the IDC SFX2100 Satellite Receiver. The device firmware contains hardcoded credentials for the admin account that cannot be changed by end users. These credentials are embedded directly within the device firmware, making them persistent across reboots and configuration changes.

The vulnerability is particularly concerning because it affects satellite communication infrastructure, which is often deployed in critical environments such as broadcast networks, emergency alert systems, and content distribution networks. An attacker with network access to the device can authenticate using the hardcoded credentials without any prior knowledge of the legitimate administrative password.

Root Cause

The root cause of this vulnerability is the use of hardcoded credentials (CWE-798) within the device firmware. This design flaw violates fundamental security principles by embedding static authentication credentials that remain constant across all deployed devices. The hardcoded admin account credentials were likely implemented for development, debugging, or maintenance purposes but were never removed or secured before production deployment.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no user interaction or prior authentication. An attacker can exploit this vulnerability by connecting to the exposed Telnet service on the SFX2100 device and authenticating using the hardcoded admin credentials.

The attack requires:

1. Network accessibility to the target SFX2100 device
2. Knowledge of the hardcoded credentials (which may be disclosed in public documentation or through reverse engineering)
3. The Telnet service enabled on the target device

Once authenticated, the attacker gains administrative access to the satellite receiver, potentially enabling configuration changes, firmware manipulation, or using the device as a pivot point for further network attacks.

For detailed technical analysis of this vulnerability, refer to Abdul Mh's Blog Vulnerability Analysis.

Detection Methods for CVE-2026-29119

Indicators of Compromise

• Unexpected Telnet connections to SFX2100 devices from unauthorized IP addresses
• Authentication events for the admin account during non-maintenance windows
• Configuration changes on satellite receivers without corresponding change management records
• Unusual outbound network traffic from satellite receiver devices

Detection Strategies

• Monitor and alert on all Telnet (port 23) connection attempts to SFX2100 satellite receivers
• Implement network segmentation monitoring to detect unauthorized access attempts to satellite infrastructure
• Deploy intrusion detection signatures for known exploitation patterns targeting IDC devices
• Review authentication logs on satellite receivers for anomalous admin login patterns

Monitoring Recommendations

• Enable comprehensive logging on all SFX2100 devices and forward logs to a centralized SIEM
• Implement network traffic analysis to detect Telnet-based authentication attempts
• Establish baseline network behavior for satellite receivers and alert on deviations
• Configure alerts for any remote administrative access outside of defined maintenance windows

How to Mitigate CVE-2026-29119

Immediate Actions Required

• Disable the Telnet service on all affected SFX2100 devices if not operationally required
• Implement network segmentation to isolate satellite receiver infrastructure from untrusted networks
• Deploy firewall rules to restrict Telnet access to authorized management IP addresses only
• Conduct an audit of all deployed SFX2100 devices to identify exposure

Patch Information

Contact International Datacasting Corporation (IDC) directly for firmware updates that address this hardcoded credential vulnerability. Monitor vendor communications for security advisories related to the SFX2100 product line. For additional technical details, refer to Abdul Mh's Blog Vulnerability Analysis.

Workarounds

• Place all SFX2100 devices behind a VPN or other secure access mechanism to limit network exposure
• Implement application-layer firewall rules to block unauthorized Telnet connections
• Use network access control lists (ACLs) to whitelist only trusted management systems
• Consider deploying a jump host or bastion server for all administrative access to satellite infrastructure

# Example firewall rule to restrict Telnet access to authorized management IP only
# iptables example for network perimeter
iptables -A INPUT -p tcp --dport 23 -s 192.168.1.100 -j ACCEPT
iptables -A INPUT -p tcp --dport 23 -j DROP

# Alternative: Disable Telnet service entirely if SSH is available
# Contact IDC for guidance on secure remote management alternatives