漏洞 (lòu dòng) means “leak; hole; gap; loophole”. It is an HSK 5 Chinese word in the HSK 3.0 vocabulary.
Practice each character:
系统存在安全漏洞。
Xìtǒng cúnzài ānquán lòudòng.
The system has security vulnerabilities.
Updated: 2026-07-18