CVE-2025-12104: Blu-ic2 Firmware Dependency Vulnerability

CVE-2025-12104 Overview

CVE-2025-12104 is a critical firmware vulnerability affecting Azure-Access BLU-IC2 and BLU-IC4 access control devices. The vulnerability stems from outdated and vulnerable UI dependencies embedded within the device firmware, which could potentially be exploited by remote attackers to compromise system integrity, confidentiality, and availability.

Access control systems like the BLU-IC2 and BLU-IC4 are commonly deployed in physical security environments to manage building access. A vulnerability of this nature in such critical infrastructure components poses significant risks to organizations relying on these devices for perimeter security.

Critical Impact

Remote attackers can potentially exploit outdated UI dependencies to compromise access control systems with no authentication required, affecting both the vulnerable device and potentially connected systems.

Affected Products

• Azure-Access BLU-IC2 Firmware through version 1.19.5
• Azure-Access BLU-IC2 Hardware
• Azure-Access BLU-IC4 Firmware through version 1.19.5
• Azure-Access BLU-IC4 Hardware

Discovery Timeline

• October 23, 2025 - CVE-2025-12104 published to NVD
• November 7, 2025 - Last updated in NVD database

Technical Details for CVE-2025-12104

Vulnerability Analysis

This vulnerability is classified under CWE-1104 (Use of Unmaintained Third Party Components), which occurs when software incorporates third-party components that are no longer actively maintained or patched by the original developer. In the case of CVE-2025-12104, the Azure-Access BLU-IC2 and BLU-IC4 devices include outdated user interface dependencies that contain known security weaknesses.

The network-accessible nature of these access control devices means that attackers with network access to the management interface can potentially leverage known exploits against the vulnerable UI components without requiring any authentication or user interaction.

Root Cause

The root cause of CVE-2025-12104 lies in the use of unmaintained third-party components within the device's user interface layer. When firmware developers incorporate external libraries or frameworks, those dependencies must be regularly updated to address newly discovered security vulnerabilities. The BLU-IC2 and BLU-IC4 firmware through version 1.19.5 contains UI dependencies that have not been updated to address known security issues, creating an exploitable attack surface.

This represents a supply chain security concern, as the vulnerable components were likely secure at the time of initial integration but became vulnerable as new weaknesses were discovered and the original maintainers released patches that were not incorporated into the firmware.

Attack Vector

The attack vector for CVE-2025-12104 is network-based, requiring no privileges or user interaction. An attacker with network access to the device's management interface can potentially target the vulnerable UI dependencies directly. The specific exploitation method would depend on which UI components are vulnerable and what known exploits exist for those components.

Given that these are access control devices, successful exploitation could allow attackers to:

• Gain unauthorized access to device management functions
• Modify access control configurations
• Compromise connected systems within the security infrastructure
• Establish persistent access to the network through the compromised device

The vulnerability's technical mechanism involves targeting known weaknesses in the outdated UI dependencies. Specific exploitation details depend on which third-party components are affected. Organizations should consult the Azure Access Security Advisories for detailed technical information about the specific vulnerable components.

Detection Methods for CVE-2025-12104

Indicators of Compromise

• Unexpected network connections originating from BLU-IC2 or BLU-IC4 devices to unknown external hosts
• Unauthorized modifications to device configurations or access control policies
• Anomalous HTTP/HTTPS traffic patterns to the device management interface
• Unusual authentication events or access attempts in device logs

Detection Strategies

• Implement network monitoring for BLU-IC2 and BLU-IC4 devices to detect suspicious traffic patterns
• Review device firmware versions and flag any running version 1.19.5 or earlier as potentially vulnerable
• Monitor web application firewall logs for exploit attempts targeting known UI component vulnerabilities
• Deploy intrusion detection signatures for known exploits affecting common UI frameworks and libraries

Monitoring Recommendations

• Enable detailed logging on all Azure-Access devices and forward logs to a centralized SIEM
• Establish baseline network behavior for access control devices and alert on deviations
• Regularly audit device configurations to detect unauthorized changes
• Monitor for vendor security advisories and patch announcements related to these devices

How to Mitigate CVE-2025-12104

Immediate Actions Required

• Inventory all Azure-Access BLU-IC2 and BLU-IC4 devices in your environment and identify firmware versions
• Restrict network access to device management interfaces using network segmentation and firewall rules
• Disable remote management access where operationally feasible until patches can be applied
• Implement additional monitoring on affected devices as described in the detection section

Patch Information

Organizations should apply firmware updates that address the vulnerable UI dependencies as soon as patches become available from Azure-Access. Monitor the Azure Access Security Advisories page for official patch releases and installation guidance. Ensure firmware upgrades are tested in a non-production environment before deployment to critical access control infrastructure.

Workarounds

• Isolate BLU-IC2 and BLU-IC4 devices on dedicated network segments with strict access controls
• Implement network-level authentication requirements (such as VPN) before allowing management interface access
• Deploy a web application firewall in front of device management interfaces to filter malicious requests
• Consider temporarily disabling the web-based management interface and using alternative management methods if available

# Network isolation example - restrict management interface access
# Add firewall rules to limit access to BLU-IC devices to trusted management hosts only
iptables -A INPUT -d <BLU-IC_IP> -p tcp --dport 443 -s <TRUSTED_MGMT_SUBNET> -j ACCEPT
iptables -A INPUT -d <BLU-IC_IP> -p tcp --dport 443 -j DROP
iptables -A INPUT -d <BLU-IC_IP> -p tcp --dport 80 -j DROP