CVE-2021-33604

LOW
Published Jun 24, 20215y ago · Modified Jun 17, 20262w ago
2.5 CVSS 3.1
Low
Find Similar
Published Jun 24, 2021 5y ago
Last Modified Jun 17, 2026 2w ago

Description

URL encoding error in development mode handler in com.vaadin:flow-server versions 2.0.0 through 2.6.1 (Vaadin 14.0.0 through 14.6.1), 3.0.0 through 6.0.9 (Vaadin 15.0.0 through 19.0.8) allows local user to execute arbitrary JavaScript code by opening crafted URL in browser.

CVSS Details

Base Score
2.5
Exploitability
1.0
Impact
1.4
Vector string
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Attack Vector Local
Attack Complexity High
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality Low
Integrity None
Availability None

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-172

Affected Products 6

VendorProductVersionRange
vaadinflow-server*≥2.0.0  –  ≤2.6.1
vaadinflow-server*≥3.0.0  –  ≤5.0.0
vaadinflow-server*≥6.0.0  –  ≤6.0.9
vaadinvaadin*≥14.0.0  –  ≤14.6.1
vaadinvaadin*≥15.0.0  –  ≤18.0.0
vaadinvaadin*≥19.0.0  –  ≤19.0.8

References 2

  • github.com https://github.com/vaadin/flow/pull/11099
    PatchThird Party Advisory
  • vaadin.com https://vaadin.com/security/cve-2021-33604
    Vendor Advisory

Remediation

  • github.com https://github.com/vaadin/flow/pull/11099
    PatchThird Party Advisory