Security readout for executives and security teams
Plain-English summary
This Vaadin issue lets a logged-in attacker change a disabled checkbox value inside an enabled CheckboxGroup. The business impact is narrow but real: workflows relying on disabled checkboxes for integrity or approval state could be bypassed. It is not known to be actively exploited from the supplied sources.
Executive priority
Prioritize remediation where Vaadin forms control approvals, permissions, billing choices, compliance attestations, or other integrity-sensitive decisions. For informational forms, urgency is lower but upgrades should still follow normal dependency maintenance.
Technical view
CVE-2021-33605 affects Vaadin CheckboxGroup handling in com.vaadin:vaadin-checkbox-flow and Vaadin 12 through 20 ranges. An improper check allows modification of a disabled Checkbox value inside an enabled CheckboxGroup. CVSS 3.1 is 4.3, network exploitable, low complexity, low privileges, no user interaction, integrity impact only.
Likely exposure
Exposure is likely limited to Vaadin web applications using the vulnerable Vaadin or vaadin-checkbox-flow versions and relying on disabled CheckboxGroup items for enforcement, decisions, approvals, or protected state.
Exploitation context
The source bundle does not show CISA KEV listing, active exploitation, or public exploit details. The CVSS vector indicates a remote, low-privileged attacker can trigger the issue without user interaction, but the affected business logic depends on application use of CheckboxGroup.
Researcher notes
The vulnerability is framed as an improper check in CheckboxGroup, but vectors are unspecified in the bundle. Avoid assuming broad Vaadin compromise. Focus validation on integrity boundaries where disabled checkbox values are trusted by application logic.
Mitigation direction
- Inventory Vaadin applications and vaadin-checkbox-flow dependency versions.
- Upgrade to vendor-advised versions outside the listed vulnerable ranges.
- Review forms using disabled Checkbox items inside enabled CheckboxGroup components.
- Enforce protected checkbox state with server-side validation and authorization.
- Monitor the Vaadin advisory for version-specific remediation guidance.
Validation and detection
- Check dependency manifests for affected Vaadin and vaadin-checkbox-flow ranges.
- Identify CheckboxGroup usage with disabled Checkbox options.
- Confirm disabled checkbox values cannot alter protected server-side state.
- Add regression tests for disabled CheckboxGroup item handling.
- Verify deployed artifacts use remediated dependency versions.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CWE-754: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-33605 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://vaadin.com/security/cve-2021-33605CVE reference · x_refsource_CONFIRM
- https://github.com/vaadin/flow-components/pull/1903CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Check for Unusual or Exceptional Conditions
Improper Check for Unusual or Exceptional Conditions represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.