CVE-2025-34254

D-Link Nuclias Connect <= v1.3.1.4 Login Account Enumeration

State: Published
Severity: 6.9 Medium
Published: Oct 16, 2025
Updated: May 25, 2026
Reserved: Apr 15, 2025

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N	VulnCheck

Weaknesses

CWE-204 Observable Response Discrepancy

Affected Products

Product	Versions
Nuclias ConnectD-Link	1.3.1.4 and earlierAffected

References

https://www.vulncheck.com/advisories/dlink-nuclias-connect-login-account-enumerationthird-party-advisory
https://www.dlink.com/en/for-business/nuclias/nuclias-connectproduct
https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10472vendor-advisory

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