# CVE-2021-31662: Memory corruption in n/a

> A buffer overflow in RIOT-OS allows attackers to obtain sensitive information, requiring a patch to mitigate the risk.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Jun 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-4r65-6rvv-8vhw

## What is CVE-2021-31662?

CVE-2021-31662 is a high-severity memory corruption vulnerability in n/a, published on 18 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

RIOT-OS 2021.01 before commit 07f1254d8537497552e7dce80364aaead9266bbe contains a buffer overflow which could allow attackers to obtain sensitive information.

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

## Which versions are affected by CVE-2021-31662?

It affects 1 product.


Products: Riot-Os Riot.

## How do I fix CVE-2021-31662?

No fix has been published for CVE-2021-31662 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-31662 being exploited?

There is no known exploitation of CVE-2021-31662 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2024-32017](https://insights.sbomify.com/CVE-2024-32017/): Buffer overflows in RIOT (critical 9.8)
- [CVE-2023-33975](https://insights.sbomify.com/CVE-2023-33975/): RIOT-OS vulnerable to Out of Bounds Write in _rbuf_add (critical 9.8)
- [CVE-2023-24819](https://insights.sbomify.com/CVE-2023-24819/): RIOT-OS vulnerable to Buffer Overflow during IPHC receive (critical 9.8)
- [CVE-2023-24823](https://insights.sbomify.com/CVE-2023-24823/): RIOT-OS vulnerable to Packet Type Confusion during IPHC send (critical 9.8)
- [CVE-2021-27357](https://insights.sbomify.com/CVE-2021-27357/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-31662 and fix it if it is affected.

What it is: CVE-2021-31662 is a high-severity memory corruption vulnerability in n/a, published on 18 Jun 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-2021-31662 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-2021-31662/ (Markdown: https://insights.sbomify.com/CVE-2021-31662/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-31662
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-31662
- OSV: https://osv.dev/vulnerability/CVE-2021-31662

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-31662/
Summaries are generated and may contain mistakes; the official description above is the record.