CVE-2021-33609 Denial of service in DataCommunicator class in Vaadin 8

What is CVE-2021-33609?

CVE-2021-33609 is a medium-severity denial of service vulnerability in Vaadin, published on 13 Oct 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Missing check in DataCommunicator class in com.vaadin:vaadin-server versions 8.0.0 through 8.14.0 (Vaadin 8.0.0 through 8.14.0) allows authenticated network attacker to cause heap exhaustion by requesting too many rows of data.

Weakness: CWE-20, CWE-400

Which versions are affected by CVE-2021-33609?

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

Products include Vaadin Vaadin.

How do I fix CVE-2021-33609?

Upgrade com.vaadin:vaadin-server to 8.14.1 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-2021-33609 being exploited?

There is no known exploitation of CVE-2021-33609 in the wild and no public exploit code.

Other vulnerabilities in Vaadin

• CVE-2021-31409 Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-19 High 7.5
• 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

Sources

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

Also known as GHSA-qcgx-crrx-38v5.