# CVE-2020-14500: IMPROPER NEUTRALIZATION OF NULL BYTE OR NUL CHARACTER CWE-158

> An attacker can exploit improper null byte handling to overwrite arbitrary data or cause denial of service in Secomea GateManager.

- **Severity:** Critical 10.0 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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:** 25 Aug 2020
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-q46g-g86v-m5qx

## What is CVE-2020-14500?

CVE-2020-14500 is a critical vulnerability in Secomea GateManager all versions prior to 9.2c, published on 25 Aug 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Secomea GateManager all versions prior to 9.2c, An attacker can send a negative value and overwrite arbitrary data.

Weakness: CWE-476 (NULL Pointer Dereference), CWE-158 (Improper Neutralization of Null Byte or NUL Character)

## Which versions are affected by CVE-2020-14500?

It affects 1 product.


Products: Secomea Gatemanager 8250 Firmware.

## How do I fix CVE-2020-14500?

No fix has been published for CVE-2020-14500 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-14500 being exploited?

There is no known exploitation of CVE-2020-14500 in the wild and no public exploit code.

## Other vulnerabilities in Secomea GateManager all versions prior to 9.2c

- [CVE-2020-14510](https://insights.sbomify.com/CVE-2020-14510/): OFF-BY-ONE ERROR CWE-193 (critical 9.8)
- [CVE-2020-29032](https://insights.sbomify.com/CVE-2020-29032/): Add integrity check of GateManager firmware (high 8.4)
- [CVE-2020-14508](https://insights.sbomify.com/CVE-2020-14508/): OFF-BY-ONE ERROR CWE-193 (high 8.1)
- [CVE-2020-14512](https://insights.sbomify.com/CVE-2020-14512/): USE OF PASSWORD HASH WITH INSUFFICIENT COMPUTATIONAL EFFORT CWE-916 (high 8.1)
- [CVE-2021-32004](https://insights.sbomify.com/CVE-2021-32004/): GateManager does not enforce strict hostname matching for WEB server (low 3.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-14500 and fix it if it is affected.

What it is: CVE-2020-14500 is a critical vulnerability in Secomea GateManager all versions prior to 9.2c, published on 25 Aug 2020. 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-2020-14500 in the wild and no public exploit code.

Affected product: Secomea GateManager all versions prior to 9.2c. 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-2020-14500/ (Markdown: https://insights.sbomify.com/CVE-2020-14500/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-14500
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-14500
- OSV: https://osv.dev/vulnerability/CVE-2020-14500

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-14500/
Summaries are generated and may contain mistakes; the official description above is the record.