CVE-2025-34253 in Nuclias Connect
Summary
by MITRE • 10/16/2025
D-Link Nuclias Connect firmware versions <= 1.3.1.4 contain a stored cross-site scripting (XSS) vulnerability due to improper sanitization of the 'Network' field when editing the configuration, creating a profile, and adding a network. An authenticated attacker can inject arbitrary JavaScript to be executed in the context of other users viewing the profile entry. NOTE: D-Link states that a fix is under development.
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Analysis
by VulDB Data Team • 11/29/2025
This vulnerability resides within the D-Link Nuclias Connect firmware ecosystem, specifically affecting versions up to and including 1.3.1.4. The stored cross-site scripting flaw manifests when users interact with the network configuration management functionality, particularly during profile editing, network creation, and configuration modification processes. The vulnerability stems from inadequate input validation and sanitization mechanisms applied to the 'Network' field, which serves as a critical data entry point for network configuration parameters. When an authenticated attacker successfully injects malicious JavaScript code into this field, the payload becomes permanently stored within the application's database or configuration storage system, making it persistent across user sessions and system interactions.
The technical exploitation of this vulnerability follows a classic stored XSS attack pattern where malicious code is initially submitted through legitimate application interfaces and subsequently executed when other users view the affected profile entries. This creates a dangerous scenario where any user with appropriate privileges to view network configurations becomes a potential victim of the stored payload execution. The vulnerability specifically targets the web interface components responsible for rendering network configuration data, allowing attackers to inject scripts that execute within the context of other users' browsers. This cross-site scripting condition violates fundamental web security principles and enables attackers to perform unauthorized actions on behalf of legitimate users, potentially leading to session hijacking, credential theft, or further escalation within the network infrastructure.
The operational impact of this vulnerability extends beyond simple script execution, as it represents a significant compromise to the integrity and confidentiality of the network management system. An authenticated attacker can leverage this flaw to establish persistent access vectors within the network environment, potentially gaining insights into network topology, configuration details, and other sensitive operational data. The vulnerability creates a persistent threat that remains active until the firmware is updated, as the malicious payloads continue to execute whenever affected pages are rendered. This stored nature of the vulnerability means that even if the initial injection occurs during a limited timeframe, the attack remains viable for extended periods, making it particularly dangerous for enterprise environments where network configuration management is frequently accessed by multiple administrators.
Security professionals should note that this vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications, and represents a clear violation of secure coding practices for input validation and output encoding. The ATT&CK framework categorizes this vulnerability under T1566, which encompasses the use of malicious code in network infrastructure devices. Organizations should implement immediate defensive measures including network segmentation to limit access to affected management interfaces, monitoring for suspicious configuration changes, and establishing robust input validation policies. The recommended mitigation strategy involves upgrading to firmware versions that address the sanitization issues in the 'Network' field processing, while also implementing additional security controls such as web application firewalls and regular security assessments of network management interfaces to prevent similar vulnerabilities from emerging in other components of the system.