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.
https://github.com/advisories/GHSA-qcgx-crrx-38v5
https://vaadin.com/security/cve-2021-33609