# CVE-2025-34255: D-Link Nuclias Connect <= v1.3.1.4 Forgot Password Account Enumeration

> Unauthenticated attackers can enumerate valid user accounts via response discrepancies in the forgot password endpoint of D-Link Nuclias Connect.

- **Severity:** Medium 6.9 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Oct 2025
- **Updated:** 25 May 2026
- **Also known as:** GHSA-fff6-x26h-q5rp

## What is CVE-2025-34255?

CVE-2025-34255 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 'Forgot Password' endpoint returns distinct JSON responses depending on whether the supplied email address is associated with an existing account. Because the responses differ in the `data.exist` boolean value, an unauthenticated remote attacker can enumerate valid email addresses/accounts on the server. NOTE: D-Link states that a fix is under development.

Weakness: CWE-204 (Observable Response Discrepancy)

## Which versions are affected by CVE-2025-34255?

It affects 1 product.


Products: Dlink Nuclias Connect.

## How do I fix CVE-2025-34255?

No fix has been published for CVE-2025-34255 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-34255 being exploited?

There is no known exploitation of CVE-2025-34255 in the wild and no public exploit code.

## Other vulnerabilities in D-Link Nuclias Connect

- [CVE-2025-34254](https://insights.sbomify.com/CVE-2025-34254/): D-Link Nuclias Connect <= v1.3.1.4 Login Account Enumeration (medium 6.9)
- [CVE-2025-34253](https://insights.sbomify.com/CVE-2025-34253/): D-Link Nuclias Connect <= v1.3.1.4 Stored Cross-Site Scripting (XSS) (medium 5.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-34255 and fix it if it is affected.

What it is: CVE-2025-34255 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.
Exploitation: There is no known exploitation of CVE-2025-34255 in the wild and no public exploit code.

Affected product: D-Link Nuclias Connect. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-34255/ (Markdown: https://insights.sbomify.com/CVE-2025-34255/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-34255
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-34255
- OSV: https://osv.dev/vulnerability/CVE-2025-34255

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-34255/
Summaries are generated and may contain mistakes; the official description above is the record.