# CVE-2021-20621: Cross-site request forgery in Aterm WG2600HP and Aterm WG2600HP2

> Remote attackers can hijack administrator authentication on NEC Aterm routers via CSRF, potentially taking over the device.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **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:** 28 Jan 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-6r2v-76j8-x9vv

## What is CVE-2021-20621?

CVE-2021-20621 is a high-severity vulnerability in NEC Corporation Aterm WG2600HP and Aterm WG2600HP2, published on 28 Jan 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

Cross-site request forgery (CSRF) vulnerability in Aterm WG2600HP firmware Ver1.0.2 and earlier, and Aterm WG2600HP2 firmware Ver1.0.2 and earlier allows remote attackers to hijack the authentication of administrators via unspecified vectors.

Weakness: CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2021-20621?

It affects 2 products.


Products: Aterm Wg2600hp2 Firmware, Aterm Wg2600hp Firmware.

## How do I fix CVE-2021-20621?

No fix has been published for CVE-2021-20621 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-20621 being exploited?

There is no known exploitation of CVE-2021-20621 in the wild and no public exploit code.

## Other vulnerabilities in NEC Corporation Aterm WG2600HP and Aterm WG2600HP2

- [CVE-2017-12575](https://insights.sbomify.com/CVE-2017-12575/): Missing authorization in n/a (high 7.5)
- [CVE-2021-20622](https://insights.sbomify.com/CVE-2021-20622/): Cross-site scripting in Aterm WG2600HP and Aterm WG2600HP2 (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20621 and fix it if it is affected.

What it is: CVE-2021-20621 is a high-severity vulnerability in NEC Corporation Aterm WG2600HP and Aterm WG2600HP2, published on 28 Jan 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-2021-20621 in the wild and no public exploit code.

Affected product: NEC Corporation Aterm WG2600HP and Aterm WG2600HP2. 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-2021-20621/ (Markdown: https://insights.sbomify.com/CVE-2021-20621/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20621
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20621
- OSV: https://osv.dev/vulnerability/CVE-2021-20621

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-20621/
Summaries are generated and may contain mistakes; the official description above is the record.