# CVE-2021-31227: Memory corruption in n/a

> A heap buffer overflow in HCC embedded InterNiche allows attackers to execute code or cause denial of service via malformed HTTP POST requests.

- **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:** 19 Aug 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-29fm-9qqr-x2gp

## What is CVE-2021-31227?

CVE-2021-31227 is a high-severity memory corruption vulnerability in n/a, published on 19 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in HCC embedded InterNiche 4.0.1. A potential heap buffer overflow exists in the code that parses the HTTP POST request, due to an incorrect signed integer comparison. This vulnerability requires the attacker to send a malformed HTTP packet with a negative Content-Length, which bypasses the size checks and results in a large heap overflow in the wbs_multidata buffer copy.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2021-31227?

It affects 1 product.


Products: Hcc-Embedded Nichestack.

## How do I fix CVE-2021-31227?

No fix has been published for CVE-2021-31227 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-31227 being exploited?

There is no known exploitation of CVE-2021-31227 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2020-35685](https://insights.sbomify.com/CVE-2020-35685/): Weak cryptography in n/a (critical 9.1)
- [CVE-2020-35683](https://insights.sbomify.com/CVE-2020-35683/): Memory corruption in n/a (high 7.5)
- [CVE-2020-35684](https://insights.sbomify.com/CVE-2020-35684/): Memory corruption in n/a (high 7.5)
- [CVE-2021-27565](https://insights.sbomify.com/CVE-2021-27565/): Denial of service in n/a (high 7.5)
- [CVE-2021-31228](https://insights.sbomify.com/CVE-2021-31228/): Weak cryptography in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-31227 and fix it if it is affected.

What it is: CVE-2021-31227 is a high-severity memory corruption vulnerability in n/a, published on 19 Aug 2021. 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-2021-31227 in the wild and no public exploit code.

Affected product: n/a. 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-2021-31227/ (Markdown: https://insights.sbomify.com/CVE-2021-31227/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-31227
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-31227
- OSV: https://osv.dev/vulnerability/CVE-2021-31227

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-31227/
Summaries are generated and may contain mistakes; the official description above is the record.