What is CVE-2023-33965?

CVE-2023-33965 is a critical-severity vulnerability in Txthinking Brook, classified under OS Command Injection. CVSS score: 9.6/10. Published 2023-06-01.

How severe is CVE-2023-33965?

Critical severity. CVSS v3 base score is 9.6 out of 10.

RCE in Txthinking Brook

CVE-2023-33965

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.

Vulnerability class: Command Injection (OS Command Injection)

Published 2023-06-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.016 (74.7th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Txthinking Brook — versions < 20230606

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

github.com/txthinking/brook/security/advisories/GHSA-vfrj-fv6p-3cpf (Vendor Advisory)
github.com/txthinking/brook/commit/314d7070c37babf6c38a0fe1eada872bb74bf03e (Patch)

Frequently asked questions

What is CVE-2023-33965?: CVE-2023-33965 is a critical-severity vulnerability in Txthinking Brook, classified under OS Command Injection. CVSS score: 9.6/10. Published 2023-06-01.
How severe is CVE-2023-33965?: Critical severity. CVSS v3 base score is 9.6 out of 10.