# CVE-2022-43392: Memory corruption in NR7101 firmware

> An authenticated attacker can cause denial-of-service conditions on Zyxel NR7101 devices by sending a crafted authorization request exploiting a buffer overflow.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Jan 2023
- **Updated:** 27 Nov 2024
- **Also known as:** GHSA-9g4h-h3jx-fcjh

## What is CVE-2022-43392?

CVE-2022-43392 is a medium-severity memory corruption vulnerability in Zyxel NR7101 firmware, published on 11 Jan 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A buffer overflow vulnerability in the parameter of web server in Zyxel NR7101 firmware prior to V1.15(ACCC.3)C0, which could allow an authenticated attacker to cause denial-of-service (DoS) conditions by sending a crafted authorization request.

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

## Which versions are affected by CVE-2022-43392?

It affects 48 products.


Products: Zyxel Ax7501-B0 Firmware, Zyxel Dx3301-T0 Firmware, Zyxel Dx4510-B1 Firmware, Zyxel Dx5401-B0 Firmware, Zyxel Emg3525-T50b Firmware, Zyxel Emg5523-T50b Firmware, Zyxel Emg5723-T50k Firmware, Zyxel Ex3301-T0 Firmware, Zyxel Ex3510-B0 Firmware, Zyxel Ex5401-B0 Firmware, Zyxel Ex5501-B0 Firmware, Zyxel Ex5510-B0 Firmware, Zyxel Ex5512-T0 Firmware, Zyxel Ex5600-T1 Firmware, Zyxel Ex5601-T0 Firmware, Zyxel Ex5601-T1 Firmware, Zyxel Lte3301-Plus Firmware, Zyxel Lte5388-M804 Firmware, Zyxel Lte5398-M904 Firmware, Zyxel Lte7240-M403 Firmware and 28 more.

## How do I fix CVE-2022-43392?

No fix has been published for CVE-2022-43392 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-43392 being exploited?

There is no known exploitation of CVE-2022-43392 in the wild and no public exploit code.

## Other vulnerabilities in Zyxel NR7101 firmware

- [CVE-2025-8693](https://insights.sbomify.com/CVE-2025-8693/): Command injection in DX3300-T0 firmware (high 8.8)
- [CVE-2022-26413](https://insights.sbomify.com/CVE-2022-26413/): Command injection in VMG3312-T20A firmware (high 8.0)
- [CVE-2024-8748](https://insights.sbomify.com/CVE-2024-8748/): Memory corruption in VMG8825-T50K firmware (high 7.5)
- [CVE-2024-5412](https://insights.sbomify.com/CVE-2024-5412/): Memory corruption in VMG8825-T50K firmware (high 7.5)
- [CVE-2024-12009](https://insights.sbomify.com/CVE-2024-12009/): Command injection in EX5601-T1 firmware (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-43392 and fix it if it is affected.

What it is: CVE-2022-43392 is a medium-severity memory corruption vulnerability in Zyxel NR7101 firmware, published on 11 Jan 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-43392 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-2022-43392/ (Markdown: https://insights.sbomify.com/CVE-2022-43392/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-43392
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-43392
- OSV: https://osv.dev/vulnerability/CVE-2022-43392

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-43392/
Summaries are generated and may contain mistakes; the official description above is the record.