CVE-2025-34254 D-Link Nuclias Connect <= v1.3.1.4 Login Account Enumeration
Unauthenticated attackers can enumerate valid usernames via response discrepancies in the login endpoint of D-Link Nuclias Connect firmware.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-34254?
CVE-2025-34254 is a medium-severity vulnerability in D-Link Nuclias Connect, published on 16 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-204
Which versions are affected by CVE-2025-34254?
It affects 1 product.
Products include Dlink Nuclias Connect.
How do I fix CVE-2025-34254?
No fix has been published for CVE-2025-34254 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-34254 being exploited?
There is no known exploitation of CVE-2025-34254 in the wild and no public exploit code.
Other vulnerabilities in D-Link Nuclias Connect
Sources
Also known as GHSA-mr7p-fqx6-72v7.