CVE-2026-28776 identifies a critical security flaw in the IDC SFX2100 SuperFlex Satellite Receiver, where hardcoded credentials exist for the 'monitor' account. These credentials are embedded in the device firmware and undocumented, allowing any remote attacker to connect via SSH without authentication. Upon login, the attacker is initially placed in a restricted shell environment; however, this restriction can be trivially bypassed to gain a full standard shell, enabling execution of arbitrary commands. The vulnerability is classified under CWE-798 (Use of Hard-coded Credentials), a common and dangerous security weakness that undermines device security by providing a backdoor access point. The CVSS 4.0 base score is 7.8 (high), reflecting the ease of exploitation (no authentication or user interaction required), network attack vector, and the potential for partial confidentiality and integrity impact. The vulnerability affects all versions of the SFX2100 model. No patches or firmware updates have been published yet, and no active exploitation has been observed. The device’s role in satellite data distribution means exploitation could disrupt or manipulate broadcast content or intercept sensitive data streams. The high scope and critical nature of satellite communications infrastructure elevate the risk profile of this vulnerability.

The exploitation of this vulnerability allows an unauthenticated attacker to gain unauthorized SSH access to IDC SFX2100 devices, potentially compromising the confidentiality and integrity of satellite broadcast data. Attackers could manipulate or disrupt data streams, inject malicious content, or use the compromised device as a foothold for lateral movement within critical infrastructure networks. Given the device’s role in satellite data distribution, this could impact broadcasters, emergency services, government agencies, and commercial entities relying on satellite communications. The ability to escape the restricted shell and execute arbitrary commands increases the risk of persistent compromise and further exploitation. The lack of authentication and user interaction requirements makes this vulnerability highly exploitable, potentially leading to widespread impact if devices are exposed to untrusted networks. Organizations may face operational disruptions, data breaches, and reputational damage. The absence of patches increases the urgency for alternative mitigations.

1. Immediately isolate IDC SFX2100 devices from untrusted networks, especially the internet, to prevent remote exploitation. 2. Disable SSH access on the devices if it is not essential for operations. 3. Implement strict network segmentation and firewall rules to restrict SSH access only to trusted management networks. 4. Monitor network traffic and device logs for unauthorized SSH login attempts or unusual activity related to the 'monitor' account. 5. Engage with IDC for firmware updates or patches addressing this vulnerability and apply them promptly once available. 6. Consider deploying intrusion detection/prevention systems (IDS/IPS) tuned to detect SSH brute force or anomalous access patterns targeting these devices. 7. Conduct regular security audits and penetration tests focusing on satellite communication infrastructure to identify and remediate similar weaknesses. 8. Develop incident response plans specifically for satellite receiver compromise scenarios to minimize operational impact. 9. If possible, replace affected devices with models that do not contain hardcoded credentials or have been verified secure. 10. Educate network and security teams about the risks of hardcoded credentials and the importance of secure device configuration.