CVE-2025-46273: UNI-NMS-Lite Auth Bypass Vulnerability

CVE-2025-46273 Overview

CVE-2025-46273 is a critical hardcoded credentials vulnerability affecting UNI-NMS-Lite, a network management system. The vulnerability allows an unauthenticated attacker to leverage hard-coded credentials embedded in the software to gain administrative privileges to all UNI-NMS managed devices. This represents a severe authentication bypass that can result in complete compromise of network infrastructure managed by the affected system.

Critical Impact

Unauthenticated attackers can gain full administrative control over all devices managed by UNI-NMS-Lite using hard-coded credentials, potentially compromising entire network infrastructures.

Affected Products

• UNI-NMS-Lite Network Management System
• All devices managed by affected UNI-NMS-Lite installations

Discovery Timeline

• 2025-04-24 - CVE-2025-46273 published to NVD
• 2025-04-29 - Last updated in NVD database

Technical Details for CVE-2025-46273

Vulnerability Analysis

This vulnerability falls under CWE-798 (Use of Hard-coded Credentials), a well-documented security weakness where authentication credentials are embedded directly within the application's source code or configuration files. In the case of UNI-NMS-Lite, the hard-coded credentials provide administrative-level access, meaning any attacker who discovers these credentials can authenticate as an administrator without needing to compromise legitimate user accounts.

The network-accessible nature of this vulnerability significantly increases its exploitability, as attackers can remotely authenticate using the hard-coded credentials without requiring prior access to the target system. The impact extends beyond the management system itself—successful exploitation grants administrative control over all devices managed by UNI-NMS-Lite, creating a cascading compromise scenario.

Root Cause

The root cause of this vulnerability is the inclusion of static authentication credentials within the UNI-NMS-Lite software. This practice violates fundamental secure coding principles, as hard-coded credentials cannot be changed without modifying the software itself and remain constant across all installations. Once discovered through reverse engineering, code analysis, or documentation leaks, these credentials become universally exploitable across all deployments of the affected software.

Attack Vector

The attack vector is network-based, requiring no user interaction or prior authentication. An attacker with network access to a UNI-NMS-Lite installation can directly authenticate using the hard-coded credentials. The exploitation process typically involves:

1. Identifying a UNI-NMS-Lite instance accessible on the network
2. Using the hard-coded credentials to authenticate to the management interface
3. Gaining administrative access to the management console
4. Pivoting to control all devices managed by the compromised UNI-NMS-Lite installation

Since no code examples are available from verified sources, organizations should consult the CISA ICS Advisory ICSA-25-114-06 for detailed technical information about this vulnerability.

Detection Methods for CVE-2025-46273

Indicators of Compromise

• Unexpected administrative login events to UNI-NMS-Lite from unrecognized IP addresses
• Authentication attempts using the default or hard-coded credential set
• Configuration changes to managed devices without corresponding authorized change requests
• Unusual access patterns to the UNI-NMS-Lite management interface during off-hours

Detection Strategies

• Implement network traffic monitoring for connections to UNI-NMS-Lite management ports from unauthorized sources
• Deploy authentication logging and alerting for all administrative access attempts
• Use network segmentation monitoring to detect lateral movement from the management system to managed devices
• Establish baseline behavior for UNI-NMS-Lite administrative activities and alert on anomalies

Monitoring Recommendations

• Enable comprehensive audit logging on UNI-NMS-Lite and all managed devices
• Monitor for bulk configuration changes across managed infrastructure that may indicate compromised administrative access
• Implement network detection rules to identify authentication attempts using known hard-coded credentials if credential details become publicly available
• Review access logs regularly for signs of unauthorized administrative sessions

How to Mitigate CVE-2025-46273

Immediate Actions Required

• Restrict network access to UNI-NMS-Lite management interfaces to trusted IP addresses only using firewall rules
• Implement network segmentation to isolate the management system from untrusted networks
• Deploy additional authentication mechanisms such as VPN requirements or jump hosts for accessing the management interface
• Audit current administrative access to identify any potential unauthorized access

Patch Information

Organizations should consult the CISA ICS Advisory ICSA-25-114-06 for official remediation guidance and vendor patch information. Contact the UNI-NMS-Lite vendor directly for updated software versions that address the hard-coded credentials vulnerability.

Workarounds

• Implement strict network access controls to limit who can reach the UNI-NMS-Lite management interface
• Deploy an additional authentication layer such as a reverse proxy with strong authentication in front of the management interface
• Consider temporarily taking UNI-NMS-Lite offline if the risk is unacceptable and alternative management solutions are available
• Monitor for vendor security updates and apply patches as soon as they become available

# Example network isolation configuration (iptables)
# Restrict access to UNI-NMS-Lite management port to trusted admin network only
iptables -A INPUT -p tcp --dport 443 -s 10.10.10.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP