CVE-2021-31405: Vaadin Flow

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

Unsafe validation RegEx in EmailField component in com.vaadin:vaadin-text-field-flow versions 2.0.4 through 2.3.2 (Vaadin 14.0.6 through 14.4.3), and 3.0.0 through 4.0.2 (Vaadin 15.0.0 through 17.0.10) allows attackers to cause uncontrolled resource consumption by submitting malicious email addresses.

Affected products

• Vaadin Flow: from 2.0.4, before 2.3.3 (fixed in 2.3.3); from 3.0.0, before 4.0.3 (fixed in 4.0.3)
• Vaadin Vaadin: from 14.0.6, before 14.4.4 (fixed in 14.4.4); from 15.0.0, before 17.0.11 (fixed in 17.0.11)

Published 2021-04-23. Last modified 2026-06-17.