CVE-2021-31409 Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-19

What is CVE-2021-31409?

CVE-2021-31409 is a high-severity denial of service vulnerability in Vaadin, published on 5 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-400

Which versions are affected by CVE-2021-31409?

2 open source packages ship an affected version, including com.vaadin:vaadin-compatibility-server. It affects 1 product.

Products include Vaadin Vaadin.

How do I fix CVE-2021-31409?

Upgrade com.vaadin:vaadin-compatibility-server to 8.13.0 or later.

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-2021-31409 being exploited?

There is no known exploitation of CVE-2021-31409 in the wild and no public exploit code.

Other vulnerabilities in Vaadin

• CVE-2020-36320 Regular expression Denial of Service (ReDoS) in EmailValidator class in Vaadin 7 High 7.5
• CVE-2021-33611 Reflected cross-site scripting in vaadin-menu-bar webjar resources in Vaadin 14 Medium 6.1
• CVE-2023-25499 Possible information disclosure in non visible components Medium 5.7
• CVE-2022-29567 Possible information disclosure inside TreeGrid component with default data provider Medium 5.7
• CVE-2019-25028 Stored cross-site scripting in Grid component in Vaadin 7 and 8 Medium 5.4

Sources

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

Also known as GHSA-c332-w4jm-55wv.