CVE-2025-34254: D-Link Nuclias Connect <= v1.3.1.4 Login Account Enumeration

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-16 · updated 2026-10-09
Weakness: CWE-204

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.

Affected products

D-Link Nuclias Connect: through 1.3.1.4

References

https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10472
https://www.dlink.com/en/for-business/nuclias/nuclias-connect
https://www.vulncheck.com/advisories/dlink-nuclias-connect-login-account-enumeration

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