CVE-2025-40736 in SINEC NMS
Summary
by MITRE • 07/08/2025
A vulnerability has been identified in SINEC NMS (All versions < V4.0). The affected application exposes an endpoint that allows an unauthorized modification of administrative credentials. This could allow an unauthenticated attacker to reset the superadmin password and gain full control of the application (ZDI-CAN-26569).
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Analysis
by VulDB Data Team • 08/21/2025
This vulnerability exists within SINEC NMS software across all versions prior to V4.0, representing a critical security flaw that undermines the application's authentication mechanisms. The issue stems from an improperly secured administrative endpoint that fails to implement adequate access controls or authentication requirements for credential modification operations. Such a design flaw creates an unauthorized access vector that directly compromises the system's security posture by allowing any remote attacker to manipulate administrative accounts without providing valid credentials or authorization. The vulnerability specifically targets the superadmin account, which represents the highest level of system privileges and control within the application.
The technical implementation of this flaw involves an endpoint that should require administrative authentication or specific authorization mechanisms before permitting password reset operations. However, the endpoint lacks proper validation checks, authentication tokens, or session management controls that would normally prevent unauthorized modifications to administrative credentials. This represents a classic case of insufficient access control, which maps directly to CWE-285 - "Improper Authorization" and aligns with ATT&CK technique T1078 - "Valid Accounts" as attackers can leverage this vulnerability to establish persistent access through administrative credentials. The vulnerability's impact is amplified by its unauthenticated nature, meaning that no prior access or credentials are required to exploit the flaw.
The operational consequences of this vulnerability are severe and far-reaching, as successful exploitation grants attackers complete administrative control over the SINEC NMS application. This level of access enables attackers to modify system configurations, manipulate data, create additional administrative accounts, and potentially establish backdoors for persistent access. The ability to reset superadmin passwords provides attackers with a direct path to system takeover, effectively neutralizing any existing security controls or monitoring mechanisms. Organizations relying on affected versions of SINEC NMS face significant risk of unauthorized system compromise, data breaches, and potential lateral movement within their network infrastructure.
Organizations should immediately implement mitigations including upgrading to SINEC NMS version 4.0 or later, which presumably addresses this vulnerability through proper access controls and authentication mechanisms. Network segmentation and firewall rules should be implemented to restrict access to administrative endpoints, while monitoring should be enhanced to detect unauthorized credential modification attempts. Additionally, organizations should conduct comprehensive security assessments to verify that no attackers have already exploited this vulnerability and should review all administrative account activities for signs of compromise. The remediation process should include disabling or restricting access to the vulnerable endpoint until the official patch is deployed and validated through proper testing procedures.