# CVE-2020-14934: Memory corruption in n/a

> Buffer overflow in Contiki-NG SNMP agent allows attackers to overwrite memory and potentially execute code on IoT devices.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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:** 18 Aug 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-v2cg-frq6-hw49

## What is CVE-2020-14934?

CVE-2020-14934 is a critical memory corruption vulnerability in n/a, published on 18 Aug 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Buffer overflows were discovered in Contiki-NG 4.4 through 4.5, in the SNMP agent. The function parsing the received SNMP request does not verify the input message's requested variables against the capacity of the internal SNMP engine buffer. If the number of variables in the request exceeds the allocated buffer, a memory write out of the buffer boundaries occurs. This write operation provides a possibility to overwrite other variables allocated in the .bss section by the application. Because the sender of the frame is in control of the content that will be written beyond the buffer limits, and there is no strict process memory separation, this issue may allow overwriting of sensitive memory areas of an IoT device.

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

## Which versions are affected by CVE-2020-14934?

It affects 1 product.


Products: Contiki-Ng Contiki-Ng.

## How do I fix CVE-2020-14934?

No fix has been published for CVE-2020-14934 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-14934 being exploited?

There is no known exploitation of CVE-2020-14934 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2018-19417](https://insights.sbomify.com/CVE-2018-19417/): Memory corruption in n/a (critical 10.0)
- [CVE-2023-30546](https://insights.sbomify.com/CVE-2023-30546/): Contiki-NG has off-by-one error in Antelope DBMS (critical 9.8)
- [CVE-2020-24336](https://insights.sbomify.com/CVE-2020-24336/): Memory corruption in n/a (critical 9.8)
- [CVE-2020-14935](https://insights.sbomify.com/CVE-2020-14935/): Memory corruption in n/a (critical 9.8)
- [CVE-2020-14936](https://insights.sbomify.com/CVE-2020-14936/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-14934 and fix it if it is affected.

What it is: CVE-2020-14934 is a critical memory corruption vulnerability in n/a, published on 18 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-2020-14934 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-2020-14934/ (Markdown: https://insights.sbomify.com/CVE-2020-14934/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-14934
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-14934
- OSV: https://osv.dev/vulnerability/CVE-2020-14934

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-14934/
Summaries are generated and may contain mistakes; the official description above is the record.