Medium severity5.3NVD Advisory· Published Oct 16, 2025· Updated Jun 17, 2026
CVE-2025-34254
CVE-2025-34254
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.messagestring value, an unauthenticated remote attacker can enumerate valid usernames/accounts on the server. NOTE: D-Link states that a fix is under development.
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Affected products
3cpe:2.3:a:dlink:nuclias_connect:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:dlink:nuclias_connect:*:*:*:*:*:*:*:*range: <=1.3.1.4
- (no CPE)range: <=1.3.1.4
- (no CPE)range: *
Patches
Vulnerability mechanics
References
3- supportannouncement.us.dlink.com/security/publication.aspxnvdVendor Advisory
- www.vulncheck.com/advisories/dlink-nuclias-connect-login-account-enumerationnvdThird Party Advisory
- www.dlink.com/en/for-business/nuclias/nuclias-connectnvdProduct
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