CVE-2021-31409

Name: CVE-2021-31409
Creator: NVD / NIST
Published: 2021-05-06T13:15:12.633+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.67%

Last modified Jun 17, 2026

CVE-2021-31409 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Unsafe validation RegEx in EmailValidator component in com.vaadin:vaadin-compatibility-server versions 8.0.0 through 8.12.4 (Vaadin versions 8.0.0 through 8.12.4) allows attackers to cause uncontrolled resource consumption by submitting malicious email addresses.. EPSS estimates a 1.67% chance of exploitation in the next 30 days.

Description

Unsafe validation RegEx in EmailValidator component in com.vaadin:vaadin-compatibility-server versions 8.0.0 through 8.12.4 (Vaadin versions 8.0.0 through 8.12.4) allows attackers to cause uncontrolled resource consumption by submitting malicious email addresses.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.67%

73.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Vaadin	Vaadin	>= 8.0.0, <= 8.12.4

References

https://github.com/vaadin/framework/issues/12240Patch, Third Party Advisory
https://github.com/vaadin/framework/pull/12241Patch, Third Party Advisory
https://vaadin.com/security/cve-2021-31409Vendor Advisory
https://github.com/vaadin/framework/issues/12240Patch, Third Party Advisory
https://github.com/vaadin/framework/pull/12241Patch, Third Party Advisory
https://vaadin.com/security/cve-2021-31409Vendor Advisory

Timeline

Published: May 6, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31409?

How severe is CVE-2021-31409?

CVE-2021-31409 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.67% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31409?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-31409?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST