# CVE-2023-37929: Memory corruption in V5.50(ABPM.8)C0 firmware

> An authenticated remote attacker can cause denial of service on Zyxel VMG3625-T50B devices via a buffer overflow in the CGI program.

- **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:** 21 May 2024
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-2c72-646m-c23c

## What is CVE-2023-37929?

CVE-2023-37929 is a medium-severity memory corruption vulnerability in Zyxel V5.50(ABPM.8)C0 firmware, published on 21 May 2024. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The buffer overflow vulnerability in the CGI program of the VMG3625-T50B firmware version V5.50(ABPM.8)C0 could allow an authenticated remote attacker to cause denial of service (DoS) conditions by sending a crafted HTTP request to a vulnerable device.

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

## Which versions are affected by CVE-2023-37929?

It affects 32 products.


Products: Zyxel Ax7501-B0 Firmware, Zyxel Ax7501-B1 Firmware, Zyxel Dx3300-T1 Firmware, Zyxel Dx3301-T0 Firmware, Zyxel Dx4510 Firmware, Zyxel Dx5401-B0 Firmware, Zyxel Dx5401-B1 Firmware, Zyxel Emg3525-T50b Firmware, Zyxel Emg5523-T50b Firmware, Zyxel Emg5723-T50k Firmware, Zyxel Ex3300-T1 Firmware, Zyxel Ex3301-T0 Firmware, Zyxel Ex3500-T0 Firmware, Zyxel Ex3501-T0 Firmware, Zyxel Ex3510 Firmware, Zyxel Ex5401-B0 Firmware, Zyxel Ex5401-B1 Firmware, Zyxel Ex5501-B0 Firmware, Zyxel Ex5510 Firmware, Zyxel Ex5512-T0 Firmware and 12 more.

## How do I fix CVE-2023-37929?

No fix has been published for CVE-2023-37929 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-37929 being exploited?

There is no known exploitation of CVE-2023-37929 in the wild and no public exploit code.

## Other vulnerabilities in Zyxel V5.50(ABPM.8)C0 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-2023-37929 and fix it if it is affected.

What it is: CVE-2023-37929 is a medium-severity memory corruption vulnerability in Zyxel V5.50(ABPM.8)C0 firmware, published on 21 May 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-37929 in the wild and no public exploit code.

Affected product: Zyxel V5.50(ABPM.8)C0 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-2023-37929/ (Markdown: https://insights.sbomify.com/CVE-2023-37929/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-37929
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-37929
- OSV: https://osv.dev/vulnerability/CVE-2023-37929

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-37929/
Summaries are generated and may contain mistakes; the official description above is the record.