# CVE-2023-2521: NEXTU NEXT-7004N POST Request formFilter cross site scripting

> Remote attackers can execute arbitrary scripts via the url parameter in the formFilter handler of NEXTU NEXT-7004N devices.

- **Severity:** Low 3.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 4 May 2023
- **Updated:** 29 Jan 2025
- **Also known as:** GHSA-43x4-4r99-6r59

## What is CVE-2023-2521?

CVE-2023-2521 is a low-severity cross-site scripting vulnerability in NEXTU NEXT-7004N, published on 4 May 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

A vulnerability was found in NEXTU NEXT-7004N 3.0.1. It has been classified as problematic. Affected is an unknown function of the file /boafrm/formFilter of the component POST Request Handler. The manipulation of the argument url with the input <svg onload=alert(1337)> leads to cross site scripting. It is possible to launch the attack remotely. The identifier of this vulnerability is VDB-228012. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2023-2521?

It affects 1 product.


Products: Ez-Net Next-7004n Firmware.

## How do I fix CVE-2023-2521?

No fix has been published for CVE-2023-2521 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-2521 being exploited?

There is no known exploitation of CVE-2023-2521 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-2521 and fix it if it is affected.

What it is: CVE-2023-2521 is a low-severity cross-site scripting vulnerability in NEXTU NEXT-7004N, published on 4 May 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2023-2521 in the wild and no public exploit code.

Affected product: NEXTU NEXT-7004N. 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-2023-2521/ (Markdown: https://insights.sbomify.com/CVE-2023-2521/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-2521
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-2521
- OSV: https://osv.dev/vulnerability/CVE-2023-2521

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-2521/
Summaries are generated and may contain mistakes; the official description above is the record.