CVE-2021-33604

Reflected cross-site scripting in development mode handler in Vaadin 14, 15-19

LOW
2.5
CVSS Score
Published: June 24, 2021 at 11:16 AM UTC
Updated: June 17, 2026 at 03:54 AM UTC
2 products affected across 1 vendorVaadinFlow Server

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Severity
LOW2.5
Exploit prediction
EPSS 0.3%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v ≥ 2.0.0v ≥ 3.0.0v ≤ 2.6.1v ≤ 6.0.92.0.0 ≤ v ≤ 2.6.13.0.0 ≤ v ≤ 5.0.06.0.0 ≤ v ≤ 6.0.92.0.03.0.0
v ≥ 14.0.0v ≥ 15.0.0v ≤ 14.6.1v ≤ 19.0.814.0.0 ≤ v ≤ 14.6.115.0.0 ≤ v ≤ 18.0.019.0.0 ≤ v ≤ 19.0.814.0.015.0.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (2)

x_refsource_CONFIRMPatchThird Party Advisory
https://github.com/vaadin/flow/pull/11099
x_refsource_CONFIRMVendor Advisory
https://vaadin.com/security/cve-2021-33604

CVSS

2.5LOWVaadin
Attack Vector
LOCAL
Complexity
HIGH
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-172NVD-CWE-Other

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