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    CVE-2025-34254

    D-Link Nuclias Connect firmware versions <= 1.3.1.4 contain an observable response discrepancy vulnerability. The application's 'Login' endpoint returns distinct JSON responses depending on whether the supplied username is associated with an existing account. Because the responses differ in the `error.message`string value, an unauthenticated remote attacker can enumerate valid usernames/accounts on the server. NOTE: D-Link states that a fix is under development.

    Published:Oct 16, 2025
    Last Modified:Mar 23, 2026
    EPS:Oct 16, 2025
    EPSS Score:0.00034
    CVSS Score:5.3

    Affected Products

    Vendor
    D-link
    Product
    Nuclias Connect
    Vendor
    Dlink
    Product
    Nuclias Connect

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-204 Observable Response Discrepancy

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High