# CVE-2023-22922: Memory corruption in NBG-418N v2 firmware

> Remote unauthenticated attackers can cause denial of service via crafted packets if Telnet is enabled on Zyxel NBG-418N v2 devices.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:** 1 May 2023
- **Updated:** 30 Jan 2025
- **Also known as:** GHSA-gchg-8x7r-rq44

## What is CVE-2023-22922?

CVE-2023-22922 is a high-severity memory corruption vulnerability in Zyxel NBG-418N v2 firmware, published on 1 May 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A buffer overflow vulnerability in the Zyxel NBG-418N v2 firmware versions prior to V1.00(AARP.14)C0 could allow a remote unauthenticated attacker to cause DoS conditions by sending crafted packets if Telnet is enabled on a vulnerable device.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2023-22922?

It affects 1 product.


Products: Zyxel Nbg-418n Firmware.

## How do I fix CVE-2023-22922?

No fix has been published for CVE-2023-22922 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-22922 being exploited?

There is no known exploitation of CVE-2023-22922 in the wild and no public exploit code.

## Other vulnerabilities in Zyxel NBG-418N v2 firmware

- [CVE-2019-6710](https://insights.sbomify.com/CVE-2019-6710/): Cross-site request forgery in n/a (high 8.8)
- [CVE-2015-7283](https://insights.sbomify.com/CVE-2015-7283/): Hardcoded credentials in n/a (high 8.1)
- [CVE-2023-22921](https://insights.sbomify.com/CVE-2023-22921/): Cross-site scripting in NBG-418N v2 firmware (high 7.5)
- [CVE-2023-22923](https://insights.sbomify.com/CVE-2023-22923/): Other in NBG-418N v2 firmware (medium 6.5)
- [CVE-2022-45441](https://insights.sbomify.com/CVE-2022-45441/): Cross-site scripting in NBG-418N v2 firmware (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-22922 and fix it if it is affected.

What it is: CVE-2023-22922 is a high-severity memory corruption vulnerability in Zyxel NBG-418N v2 firmware, published on 1 May 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-2023-22922 in the wild and no public exploit code.

Affected product: Zyxel NBG-418N v2 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-2023-22922/ (Markdown: https://insights.sbomify.com/CVE-2023-22922/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-22922
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-22922
- OSV: https://osv.dev/vulnerability/CVE-2023-22922

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-22922/
Summaries are generated and may contain mistakes; the official description above is the record.