CVE-2021-3689: Yiiframework Yii

High severity, CVSS 7.5. EPSS: 1.9% chance of exploitation in the next 30 days.

yii2 is vulnerable to Use of Predictable Algorithm in Random Number Generator

Affected products

• Yiiframework Yii: from 2.0.0, before 2.0.43 (fixed in 2.0.43)

Published 2021-08-10. Last modified 2026-06-17.