---
id: 7375
title: "[CVE-2021-32763] Giới thiệu về kỹ thuật Regular Expression Denial of Service"
cve: CVE-2021-32763
source_domain: blog.viettelcybersecurity.com
source_url: "https://blog.viettelcybersecurity.com/gioi-thieu-ve-ky-thuat-regular-expression-denial-of-service/"
published_at: "2021-09-23T07:49:20Z"
tags: ["regex", "vulnerability-analysis", "dos", "redos", "cve-2021-32763", "openproject"]
phying_url: "https://phying.com/item/7375"
lang: en
---

# [CVE-2021-32763] Giới thiệu về kỹ thuật Regular Expression Denial of Service

## Summary

Using CVE-2021-32763, a ReDoS in OpenProject, as a case study, the author explains regex denial of service through NFA/DFA theory and how evil regexes trigger catastrophic backtracking.

## Intelligence Metadata

- **Sources:** blog.viettelcybersecurity.com
- **CVE:** CVE-2021-32763
- **Published:** 2021-09-23T07:49:20Z
- **Original:** https://blog.viettelcybersecurity.com/gioi-thieu-ve-ky-thuat-regular-expression-denial-of-service/
- **Phying News:** https://phying.com/item/7375