Unauthorized property update in CheckboxGroup component in Vaadin 12-14 and 15-20

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

4.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS

• CVE-2021-33605: 0.66% estimated exploitation activity in the next 30 days; percentile 51.84 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Improper check in CheckboxGroup in com.vaadin:vaadin-checkbox-flow versions 1.2.0 prior to 2.0.0 (Vaadin 12.0.0 prior to 14.0.0), 2.0.0 prior to 3.0.0 (Vaadin 14.0.0 prior to 14.5.0), 3.0.0 through 4.0.1 (Vaadin 15.0.0 through 17.0.11), 14.5.0 through 14.6.7 (Vaadin 14.5.0 through 14.6.7), and 18.0.0 through 20.0.5 (Vaadin 18.0.0 through 20.0.5) allows attackers to modify the value of a disabled Checkbox inside enabled CheckboxGroup component via unspecified vectors. - https://vaadin.com/security/cve-2021-33605

Published by the source

30 Aug 2021, 16:16 UTC

Last modified by the source

1 May 2023, 20:34 UTC

Source last checked

26 Oct 2026, 16:11 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-qcc4-3rxf-gf4m

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# Patch Next advisory brief: CVE-2021-33605

Advisory: Unauthorized property update in CheckboxGroup component in Vaadin 12-14 and 15-20
IDs: CVE-2021-33605, GHSA-qcc4-3rxf-gf4m
Record: https://patchnext.com/advisories/cve-2021-33605 (revision 1, source checked 26 Oct 2026, 16:11 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: com.vaadin:vaadin-checkbox-flow 20.0.6, 14.6.8. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven com.vaadin:vaadin-checkbox-flow: affected >= 12.0.0, < 14.6.8; >= 15.0.0, < 20.0.6; fixed in 14.6.8, 20.0.6

## Suggested inspection (read-only)
- Maven com.vaadin:vaadin-checkbox-flow: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on com.vaadin:vaadin-checkbox-flow.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-qcc4-3rxf-gf4m (GitHub-reviewed advisory GHSA-qcc4-3rxf-gf4m lists affected ranges: Maven com.vaadin:vaadin-checkbox-flow >=12.0.0 =15.0.0 <20.0.6)

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