# CVE-2021-20644: Cross-site scripting in WRC-1467GHBK-A

> Attackers can execute arbitrary scripts in users' browsers via a crafted SSID on the router's web setup page.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 12 Feb 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-chg9-84gg-7qpw

## What is CVE-2021-20644?

CVE-2021-20644 is a medium-severity cross-site scripting vulnerability in ELECOM CO.,LTD. WRC-1467GHBK-A, published on 12 Feb 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

ELECOM WRC-1467GHBK-A allows arbitrary scripts to be executed on the user's web browser by displaying a specially crafted SSID on the web setup page.

Weakness: CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2021-20644?

It affects 1 product.


Products: Elecom Wrc-1467ghbk-a Firmware.

## How do I fix CVE-2021-20644?

No fix has been published for CVE-2021-20644 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-20644 being exploited?

There is no known exploitation of CVE-2021-20644 in the wild and no public exploit code.

## Other vulnerabilities in ELECOM CO.,LTD. WRC-1467GHBK-A

- [CVE-2023-39445](https://insights.sbomify.com/CVE-2023-39445/): Code injection in LAN-WH300N/RE (high 8.8)
- [CVE-2023-39455](https://insights.sbomify.com/CVE-2023-39455/): Command injection in WRC-1467GHBK-A (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20644 and fix it if it is affected.

What it is: CVE-2021-20644 is a medium-severity cross-site scripting vulnerability in ELECOM CO.,LTD. WRC-1467GHBK-A, published on 12 Feb 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-20644 in the wild and no public exploit code.

Affected product: ELECOM CO.,LTD. WRC-1467GHBK-A. 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-2021-20644/ (Markdown: https://insights.sbomify.com/CVE-2021-20644/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20644
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20644
- OSV: https://osv.dev/vulnerability/CVE-2021-20644

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-20644/
Summaries are generated and may contain mistakes; the official description above is the record.