CVE-2021-31405 Regular expression denial of service (ReDoS) in EmailField component in Vaadin 14 and 15-17

What is CVE-2021-31405?

CVE-2021-31405 is a high-severity denial of service vulnerability in Vaadin, published on 23 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-400

Which versions are affected by CVE-2021-31405?

4 open source packages ship an affected version, including com.vaadin:vaadin-bom. It affects 2 products.

Products include Vaadin Flow, Vaadin Vaadin.

How do I fix CVE-2021-31405?

Upgrade com.vaadin:vaadin-bom to a fixed version for your release line: 14.4.4 or 17.0.11.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-31405 being exploited?

There is no known exploitation of CVE-2021-31405 in the wild and no public exploit code.

Other vulnerabilities in Vaadin

• CVE-2021-31407 Server classes and resources exposure in OSGi applications using Vaadin 12-14 and 19 High 8.6
• CVE-2021-31411 Insecure temporary directory usage in frontend build functionality of Vaadin 14 and 15-19 Medium 6.3
• CVE-2021-31408 Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-19 Medium 6.3
• CVE-2019-25027 Reflected cross-site scripting in default RouteNotFoundError view in Vaadin 10 and 11-13 Medium 6.1
• CVE-2020-36321 Directory traversal in development mode handler in Vaadin 14 and 15-17 Medium 5.9

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-2wqp-jmcc-mc77.