What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-10-13 · updated 2026-06-17
• Weakness: CWE-400

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.

Affected products

• Vaadin: from 8.0.0 before 8.14.1 — fixed in 8.14.1

How to fix

Upgrade to a fixed version: Vaadin 8.14.1. Check the vendor advisory for mitigations.

References

• https://github.com/vaadin/framework/pull/12415
• https://vaadin.com/security/cve-2021-33609
• https://github.com/vaadin/framework/pull/12415
• https://vaadin.com/security/cve-2021-33609

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