CVE-2025-34254: D-Link Nuclias Connect

Medium severity, CVSS 5.3. EPSS: 1% chance of exploitation in the next 30 days.

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.

Affected products

• D-Link Nuclias Connect: up to and including 1.3.1.4

Published 2025-10-16. Last modified 2026-10-09.