CVE-2025-6763: Cometsystem T7611 Auth Bypass Vulnerability

CVE-2025-6763 Overview

A missing authentication vulnerability has been identified in multiple Comet System IoT devices, including models T0510, T3510, T3511, T4511, T6640, T7511, T7611, P8510, P8552, and H3531 running firmware version 1.60. The vulnerability exists in the Web-based Management Interface, specifically affecting the /setupA.cfg file endpoint. When exploited, this flaw allows remote attackers to bypass authentication mechanisms and potentially gain unauthorized access to device configuration.

Critical Impact

Remote attackers can potentially bypass authentication on affected Comet System IoT devices, enabling unauthorized access to sensitive configuration data and device control. The vendor disputes this vulnerability, stating devices are not intended for internet exposure.

Affected Products

• Comet System T0510 Firmware version 1-5-7-5.1252
• Comet System T3510 Firmware version 1-5-7-5.1252
• Comet System T3511 Firmware version 1-5-7-2.1151
• Comet System T4511 Firmware version 1-5-7-5.1252
• Comet System T6640 Firmware version 1-5-7-5.1252
• Comet System T7511 Firmware version 1-5-7-5.1251
• Comet System T7611 Firmware version 1-5-7-5.1252
• Comet System P8510 Firmware version 4-5-8-0.3488
• Comet System P8552 Firmware version 4-5-8-1.3502
• Comet System H3531 Firmware version 9-5-0-1.1327

Discovery Timeline

• June 27, 2025 - CVE-2025-6763 published to NVD
• October 8, 2025 - Last updated in NVD database

Technical Details for CVE-2025-6763

Vulnerability Analysis

This vulnerability is classified under CWE-287 (Improper Authentication) and CWE-306 (Missing Authentication for Critical Function). The affected Comet System devices expose a web-based management interface that fails to properly enforce authentication when accessing the /setupA.cfg configuration file. While exploitation requires a high degree of complexity, a proof-of-concept has been made publicly available.

The vendor has disputed the severity of this vulnerability, explaining that these devices are not designed to be exposed to the internet and that proper security implementation is the responsibility of end-users. However, organizations deploying these IoT sensors and transmitters in industrial environments should evaluate their network segmentation practices.

Root Cause

The root cause of this vulnerability stems from missing authentication checks on the /setupA.cfg file within the Web-based Management Interface. The affected firmware does not properly validate user credentials before allowing access to configuration endpoints, enabling unauthenticated requests to potentially retrieve or manipulate device settings. This represents a fundamental design flaw where critical functions lack appropriate access controls.

Attack Vector

The attack is network-based and can be initiated remotely against affected devices. Successful exploitation requires the attacker to have network access to the device's web management interface. The attack complexity is high, meaning specific conditions must be met for successful exploitation. No user interaction is required, and no prior privileges are needed to attempt the attack. The public availability of exploit information increases the risk for devices that are inadvertently exposed to untrusted networks.

For technical details regarding the proof-of-concept, refer to the GitHub PoC for CVE Request.

Detection Methods for CVE-2025-6763

Indicators of Compromise

• Unexpected HTTP requests to /setupA.cfg from unauthorized IP addresses
• Configuration changes on Comet System devices without legitimate administrative activity
• Network traffic patterns indicating unauthorized access attempts to device management interfaces
• Log entries showing unauthenticated access to configuration endpoints

Detection Strategies

• Monitor network traffic for HTTP requests targeting /setupA.cfg on Comet System device IPs
• Implement IDS/IPS rules to detect and alert on attempts to access IoT device configuration files without proper authentication
• Conduct regular audits of device configurations to identify unauthorized modifications
• Deploy network monitoring solutions to track all communications with affected IoT devices

Monitoring Recommendations

• Implement network segmentation to isolate Comet System devices from untrusted networks
• Enable logging on network firewalls and review access attempts to device management interfaces
• Use SentinelOne Singularity Platform to monitor network communications for suspicious patterns targeting IoT infrastructure
• Establish baseline behavior for device communications and alert on anomalies

How to Mitigate CVE-2025-6763

Immediate Actions Required

• Ensure all affected Comet System devices are not directly exposed to the internet
• Implement strict network segmentation to limit access to device management interfaces
• Deploy firewall rules to restrict access to the web management interface to trusted administrator IPs only
• Review current device deployments and verify network isolation measures are in place

Patch Information

No official security patch has been released by Comet System at this time. The vendor's position is that these devices should not be internet-facing and that proper security is the responsibility of end-users. Organizations should monitor for firmware updates from Comet System and apply them when available. Additional technical information is available at VulDB #314074 and the GitHub CVE Request Repository.

Workarounds

• Deploy affected devices behind firewalls with strict access control lists
• Use VPN connections for remote administration rather than exposing management interfaces
• Implement network access control (NAC) to authenticate devices attempting to communicate with affected sensors
• Consider deploying a reverse proxy with authentication in front of device management interfaces

# Example firewall rule to restrict access to device management interface
# Allow only trusted management subnet
iptables -A INPUT -p tcp --dport 80 -s 10.10.10.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP