# CVE-2022-4874: Auth bypass in NF20

> Unauthenticated attackers can bypass authentication on Netcomm routers to access static content due to flawed session handling logic.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Jan 2023
- **Updated:** 4 Nov 2025
- **Also known as:** GHSA-6pwv-hr7p-g77v

## What is CVE-2022-4874?

CVE-2022-4874 is a high-severity authentication bypass vulnerability in Netcomm NF20, published on 11 Jan 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Authentication bypass in Netcomm router models NF20MESH, NF20, and NL1902 allows an unauthenticated user to access content. In order to serve static content, the application performs a check for the existence of specific characters in the URL (.css, .png etc). If it exists, it performs a "fake login" to give the request an active session to load the file and not redirect to the login page.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2022-4874?

It affects 3 products.


Products: Netcommwireless Nf20 Firmware, Netcommwireless Nf20mesh Firmware, Netcommwireless Nl1902 Firmware.

## How do I fix CVE-2022-4874?

No fix has been published for CVE-2022-4874 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-4874 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-4874 exists.

## Other vulnerabilities in Netcomm NF20

- [CVE-2022-4873](https://insights.sbomify.com/CVE-2022-4873/): Stack based overflow on Netcomm router models NF20MESH, NF20, and NL1902 (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-4874 and fix it if it is affected.

What it is: CVE-2022-4874 is a high-severity authentication bypass vulnerability in Netcomm NF20, published on 11 Jan 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-4874 exists.

Affected product: Netcomm NF20. 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-2022-4874/ (Markdown: https://insights.sbomify.com/CVE-2022-4874/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-4874
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-4874
- OSV: https://osv.dev/vulnerability/CVE-2022-4874

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-4874/
Summaries are generated and may contain mistakes; the official description above is the record.