CVE-2021-31407: Vulnerability in OSGi applications using Vaadin 12-14 and 19

com.vaadin:flow-server Updated 02 Oct 2025

Summary

19/04/2021

Disclosed on

CVE-2021-31407

CVE

Yes i

Fix available

High

Severity

8.6

CVSS Score

CVE-2021-31407: OSGi applications using Vaadin 12-14 and 19 vulnerable to server classes and resources exposure. Affects com.vaadin:flow-server across 2 version ranges.

>= 1.2.0, < 2.4.8 >= 6.0.0, < 6.0.1

Fixed in 2.4.8 or 6.0.1, depending on the release line you run. How to fix ↓

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Background

The com.vaadin:flow-server package is an OSGi integration for Vaadin applications. Vaadin is a Java framework used for building web applications. This vulnerability affects versions 1.2.0 through 2.4.7 (Vaadin 12.0.0 through 14.4.9) and 6.0.0 through 6.0.1 (Vaadin 19.0.0).

Vulnerability Detail

The vulnerability allows an attacker to access application classes and resources on the server by sending a crafted HTTP request. This can lead to unauthorized access and potential information disclosure. The vulnerability has a CVSS score of 8.6, indicating a high severity level.

How To Fix

Latest published version: 25.3.4 as of 23 Oct 2026

Upgrading to it may include breaking changes; the versions below are the minimum fixed release for this vulnerability.

If you can't move to the latest

The minimum fixed version depends on the release line you run.

>= 1.2.0, < 2.4.8 2.4.8
>= 6.0.0, < 6.0.1 6.0.1

Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →

Workaround

There is no known workaround for this vulnerability. It is crucial to apply the recommended fix by upgrading to the fixed versions.

Conclusion

The vulnerability in OSGi applications using Vaadin 12-14 and 19 allows unauthorized access to server classes and resources. It is crucial to upgrade to the fixed versions of com.vaadin:flow-server to mitigate the risk of information disclosure. For further assistance and support on vulnerability remediation, please contact DevNack.com.

See every vulnerability recorded for com.vaadin:flow-server →

FAQ

What is the impact of this vulnerability?

The vulnerability allows unauthorized access to application classes and resources on the server, potentially leading to information disclosure.

How can I check if my application is affected?

You can use the Vulert Playground at Vulert Scanner to check if your application is affected by this vulnerability. Simply provide your pom.xml file for analysis.

Are all versions of `com.vaadin:flow-server` affected?

No, only versions 1.2.0 through 2.4.7 (Vaadin 12.0.0 through 14.4.9) and 6.0.0 through 6.0.1 (Vaadin 19.0.0) are affected. It is recommended to upgrade to the fixed versions.