Vulnerability in D-Link Nuclias Connect
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 · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.010 (62.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: +0.001
Affected products
- D-Link Nuclias Connect — versions 0
- Dlink Nuclias Connect
Weakness classification (CWE)
References
- www.vulncheck.com/advisories/dlink-nuclias-connect-login-account-enumeration (Third Party Advisory, third-party-advisory)
- www.dlink.com/en/for-business/nuclias/nuclias-connect (Product, product)
- supportannouncement.us.dlink.com/security/publication.aspx (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-34254?
- CVE-2025-34254 is a medium-severity vulnerability in D-Link Nuclias Connect, classified under Observable Response Discrepancy. CVSS score: 5.3/10. Published 2025-10-16.
- How severe is CVE-2025-34254?
- Medium severity. CVSS v3 base score is 5.3 out of 10.