# CVE-2018-21209: Cross-site scripting in n/a

> Reflected XSS in NETGEAR routers allows attackers to execute scripts in user browsers, potentially leading to session hijacking or data theft.

- **Severity:** Medium 4.8 (`CVSS:3.0/AC:L/AV:A/A:N/C:L/I:L/PR:H/S:C/UI:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Apr 2020
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-mwvg-rm6p-8rhr

## What is CVE-2018-21209?

CVE-2018-21209 is a medium-severity cross-site scripting vulnerability in Netgear Jr6150 Firmware, published on 28 Apr 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Certain NETGEAR devices are affected by reflected XSS. This affects JNR1010v2 before 1.1.0.46, JR6150 before 1.0.1.10, JWNR2010v5 before 1.1.0.46, PR2000 before 1.0.0.20, R6050 before 1.0.1.10, R6220 before 1.1.0.60, WNDR3700v5 before 1.1.0.50, WNR1000v4 before 1.1.0.46, WNR2020 before 1.1.0.46, and WNR2050 before 1.1.0.46.

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

## Which versions are affected by CVE-2018-21209?

It affects 10 products.


Products: Netgear Jnr1010 Firmware, Netgear Jr6150 Firmware, Netgear Jwnr2010 Firmware, Netgear Pr2000 Firmware, Netgear R6050 Firmware, Netgear R6220 Firmware, Netgear Wndr3700 Firmware, Netgear Wnr1000 Firmware, Netgear Wnr2020 Firmware, Netgear Wnr2050 Firmware.

## How do I fix CVE-2018-21209?

No fix has been published for CVE-2018-21209 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-21209 being exploited?

There is no known exploitation of CVE-2018-21209 in the wild and no public exploit code.

## Other vulnerabilities in Netgear Jr6150 Firmware

- [CVE-2016-11014](https://insights.sbomify.com/CVE-2016-11014/): Auth bypass in n/a (critical 9.8)
- [CVE-2018-21226](https://insights.sbomify.com/CVE-2018-21226/): Auth bypass in n/a (high 8.8)
- [CVE-2017-18734](https://insights.sbomify.com/CVE-2017-18734/): Command injection in n/a (high 8.8)
- [CVE-2017-18737](https://insights.sbomify.com/CVE-2017-18737/): Command injection in n/a (high 8.8)
- [CVE-2017-18749](https://insights.sbomify.com/CVE-2017-18749/): Cross-site request forgery in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-21209 and fix it if it is affected.

What it is: CVE-2018-21209 is a medium-severity cross-site scripting vulnerability in Netgear Jr6150 Firmware, published on 28 Apr 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-21209 in the wild and no public exploit code.

Affected product: Netgear Jr6150 Firmware. 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-2018-21209/ (Markdown: https://insights.sbomify.com/CVE-2018-21209/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-21209
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-21209
- OSV: https://osv.dev/vulnerability/CVE-2018-21209

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-21209/
Summaries are generated and may contain mistakes; the official description above is the record.