# CVE-2022-43389: Memory corruption in NR7101 firmware

> An unauthenticated attacker can execute OS commands or cause denial-of-service on Zyxel NR7101 devices via a buffer overflow in the web server library.

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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:** 9 Apr 2025
- **Also known as:** GHSA-356g-gwg5-3vmc

## What is CVE-2022-43389?

CVE-2022-43389 is a high-severity memory corruption vulnerability in Zyxel NR7101 firmware, published on 11 Jan 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 library of the web server in Zyxel NR7101 firmware prior to V1.15(ACCC.3)C0, which could allow an unauthenticated attacker to execute some OS commands or to cause denial-of-service (DoS) conditions on a vulnerable device.

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

## Which versions are affected by CVE-2022-43389?

It affects 17 products.


Products: Zyxel Ep240p Firmware, Zyxel Lte3202-M437 Firmware, Zyxel Lte3316-M604 Firmware, Zyxel Lte7480-M804 Firmware, Zyxel Lte7490-M904 Firmware, Zyxel Nebula Fwa510 Firmware, Zyxel Nebula Fwa710 Firmware, Zyxel Nebula Nr7101 Firmware, Zyxel Nr5103 Firmware, Zyxel Nr5103e Firmware, Zyxel Nr7101 Firmware, Zyxel Nr7102 Firmware, Zyxel Nr7103 Firmware, Zyxel Pm7320-B0 Firmware, Zyxel Pmg5317-T20b Firmware, Zyxel Pmg5617ga Firmware, Zyxel Pmg5622ga Firmware.

## How do I fix CVE-2022-43389?

No fix has been published for CVE-2022-43389 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-43389 being exploited?

There is no known exploitation of CVE-2022-43389 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-43389 and fix it if it is affected.

What it is: CVE-2022-43389 is a high-severity memory corruption vulnerability in Zyxel NR7101 firmware, 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-2022-43389 in the wild and no public exploit code.

Affected product: Zyxel NR7101 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-2022-43389/ (Markdown: https://insights.sbomify.com/CVE-2022-43389/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-43389
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-43389
- OSV: https://osv.dev/vulnerability/CVE-2022-43389

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-43389/
Summaries are generated and may contain mistakes; the official description above is the record.