CVE-2025-34254 · Severity: medium · CVSS 5.3 · Published 2025-10-16
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.
No. Junglewise Threat Intelligence has no report of CVE-2025-34254 being exploited in the wild.
How severe is CVE-2025-34254?
Medium severity, with a CVSS score of 5.3, published 16 October 2025.
Which products and versions are affected?
Dlink Nuclias Connect. The advisory does not name versions.
Is there a fix for CVE-2025-34254?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2025-34254?
Check whether you run Dlink Nuclias Connect. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.