What is CVE-2021-31405?

CVE-2021-31405 is a high-severity vulnerability in Vaadin Flow, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2021-04-23.

How severe is CVE-2021-31405?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Vaadin Flow

CVE-2021-31405

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.

Vulnerability class: DoS (Denial of Service)

Published 2021-04-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.011 (65.8th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Vaadin Flow
Vaadin — versions 14.0.6
Vaadin Vaadin-Text-Field-Flow — versions 2.0.4

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

vaadin.com/security/cve-2021-31405 (Vendor Advisory)
github.com/vaadin/flow-components/pull/442 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-31405?: CVE-2021-31405 is a high-severity vulnerability in Vaadin Flow, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2021-04-23.
How severe is CVE-2021-31405?: High severity. CVSS v3 base score is 7.5 out of 10.