# CVE-2022-4873: Stack based overflow on Netcomm router models NF20MESH, NF20, and NL1902

> A stack-based buffer overflow in Netcomm routers allows attackers to crash the application by overwriting the instruction pointer via the sessionKey parameter.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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:** Not needed
- **Fix available:** No
- **Published:** 11 Jan 2023
- **Updated:** 4 Nov 2025
- **Also known as:** GHSA-5fm2-88hc-cx64

## What is CVE-2022-4873?

CVE-2022-4873 is a critical memory corruption 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

On Netcomm router models NF20MESH, NF20, and NL1902 a stack based buffer overflow affects the sessionKey parameter. By providing a specific number of bytes, the instruction pointer is able to be overwritten on the stack and crashes the application at a known location.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2022-4873?

It affects 3 products.


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

## How do I fix CVE-2022-4873?

No fix has been published for CVE-2022-4873 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-4873 being exploited?

There is no known exploitation of CVE-2022-4873 in the wild and no public exploit code.

## Other vulnerabilities in Netcomm NF20

- [CVE-2022-4874](https://insights.sbomify.com/CVE-2022-4874/): Auth bypass in NF20 (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-4873 and fix it if it is affected.

What it is: CVE-2022-4873 is a critical memory corruption 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: There is no known exploitation of CVE-2022-4873 in the wild and no public exploit code.

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-2022-4873/ (Markdown: https://insights.sbomify.com/CVE-2022-4873/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-4873
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-4873
- OSV: https://osv.dev/vulnerability/CVE-2022-4873

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-4873/
Summaries are generated and may contain mistakes; the official description above is the record.