CVE-2025-56015: GenieACS Auth Bypass Vulnerability

CVE-2025-56015 Overview

CVE-2025-56015 is an unauthenticated access vulnerability discovered in GenieACS version 1.2.13. The vulnerability exists in the NBI (Northbound Interface) API endpoint, allowing unauthorized users to access the API without proper authentication. This improper access control weakness (CWE-284) enables network-based attackers to potentially retrieve sensitive configuration data from managed devices without requiring any credentials.

Critical Impact

Unauthenticated attackers can access the GenieACS NBI API endpoint, potentially exposing sensitive device configuration and management data from TR-069 managed devices.

Affected Products

• GenieACS 1.2.13

Discovery Timeline

• April 7, 2026 - CVE-2025-56015 published to NVD
• April 9, 2026 - Last updated in NVD database

Technical Details for CVE-2025-56015

Vulnerability Analysis

This vulnerability stems from improper access control (CWE-284) in the GenieACS NBI API. GenieACS is an open-source Auto Configuration Server (ACS) used for managing TR-069 enabled devices such as routers, modems, and other CPE (Customer Premises Equipment). The NBI API serves as the northbound interface that allows external systems to interact with GenieACS for device provisioning, configuration management, and data retrieval.

The vulnerability allows unauthenticated users to access the NBI API endpoint without presenting valid credentials. This means any network-accessible attacker can query the API to extract potentially sensitive information about managed devices, including configuration parameters, device identifiers, and network settings. The attack requires no privileges or user interaction, making it particularly dangerous in environments where the GenieACS instance is exposed to untrusted networks.

Root Cause

The root cause of this vulnerability is improper access control implementation in the NBI API endpoint of GenieACS 1.2.13. The application fails to properly enforce authentication requirements before processing API requests, allowing any network-accessible client to interact with the API without first establishing an authenticated session. This represents a fundamental breakdown in the authentication boundary that should protect administrative interfaces.

Attack Vector

The attack vector is network-based, requiring no authentication, no user interaction, and presents low complexity for exploitation. An attacker can remotely access the NBI API endpoint directly over the network. Since GenieACS is typically deployed to manage network infrastructure devices, successful exploitation could expose sensitive CPE device configurations, subscriber information, and network topology details.

The vulnerability can be exploited by sending HTTP requests directly to the NBI API endpoint. Technical details and proof-of-concept information are available in the CVE-2025-56015 PoC Repository. For additional context on the GenieACS project, refer to the official GenieACS repository.

Detection Methods for CVE-2025-56015

Indicators of Compromise

• Unexpected or anomalous HTTP requests to the NBI API endpoint from unknown IP addresses
• API access logs showing requests without corresponding authentication events
• Unusual query patterns targeting device configuration or sensitive data endpoints
• Network traffic to NBI API ports from external or unauthorized network segments

Detection Strategies

• Monitor GenieACS NBI API access logs for unauthenticated request attempts
• Implement network traffic analysis to identify connections to the NBI API from unauthorized sources
• Deploy intrusion detection rules to alert on direct NBI API access attempts
• Review authentication logs for missing or failed authentication preceding API access

Monitoring Recommendations

• Enable comprehensive logging on the GenieACS NBI API endpoint
• Configure SIEM alerts for unauthenticated API access patterns
• Monitor network flows to and from the GenieACS server for anomalous connections
• Implement real-time alerting for any API access from non-whitelisted IP addresses

How to Mitigate CVE-2025-56015

Immediate Actions Required

• Restrict network access to the NBI API endpoint using firewall rules or network segmentation
• Implement authentication at the network layer (VPN, reverse proxy with authentication) until a patch is available
• Audit existing access logs to identify potential prior exploitation
• Review and limit IP addresses allowed to connect to the GenieACS NBI interface

Patch Information

No vendor patch information is currently available in the CVE data. Organizations should monitor the GenieACS GitHub repository for security updates and new releases that address this vulnerability. Until an official patch is released, implement the recommended workarounds to reduce exposure.

Workarounds

• Place the GenieACS NBI API behind an authenticated reverse proxy (e.g., nginx with basic authentication or OAuth)
• Restrict NBI API access to specific trusted IP addresses using firewall rules
• Deploy network segmentation to isolate the GenieACS server from untrusted networks
• Consider temporarily disabling the NBI API if it is not operationally required

# Example: Restrict NBI API access using iptables
# Only allow access from trusted management network (10.0.0.0/24)
iptables -A INPUT -p tcp --dport 7557 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 7557 -j DROP