CVE-2021-33604

lowpriority · track · 10EPSS 0.003 · 21 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.29% (21st) EPSS

CVSS 1.2 · low

Is it mine?

16 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

2.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.01.2lowAV:L/AC:H/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 1.9 · impact 2.9

v3.12.5lowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 1 · impact 1.4

v3.12.5lowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:Nsecondary · ENISA EU

v3.12.5lowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:Nsecondary · security@vaadin.comexploitability 1 · impact 1.4

v3.12.5lowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:Nsecondary · OSV

v3.12.3lowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-172USCWE-172US

affected products (16)

Products and version ranges known to be affected.

Vaadin Vaadin≤ unspecified ≤14.6.1enisa_euvdEU
Vaadin Vaadin≤ unspecified ≤19.0.8enisa_euvdEU
Vaadin Vaadin14.0.0 → unspecifiedenisa_euvdEU
Vaadin Vaadin15.0.0 → unspecifiedenisa_euvdEU
Vaadin flow-server≤ unspecified ≤6.0.9enisa_euvdEU
Vaadin flow-server≤ unspecified ≤2.6.1enisa_euvdEU
Vaadin flow-server2.0.0 → unspecifiedenisa_euvdEU
Vaadin flow-server3.0.0 → unspecifiedenisa_euvdEU
vaadin flow-server2.0.0 → 2.6.1nvdUScpe:2.3:a:vaadin:flow-server:*:*:*:*:*:*:*:*
vaadin flow-server3.0.0 → 5.0.0nvdUScpe:2.3:a:vaadin:flow-server:*:*:*:*:*:*:*:*
vaadin flow-server6.0.0 → 6.0.9nvdUScpe:2.3:a:vaadin:flow-server:*:*:*:*:*:*:*:*
vaadin vaadin14.0.0 → 14.6.1nvdUScpe:2.3:a:vaadin:vaadin:*:*:*:*:*:*:*:*
vaadin vaadin15.0.0 → 18.0.0nvdUScpe:2.3:a:vaadin:vaadin:*:*:*:*:*:*:*:*
vaadin vaadin19.0.0 → 19.0.8nvdUScpe:2.3:a:vaadin:vaadin:*:*:*:*:*:*:*:*
Maven com.vaadin:vaadin-bom14.0.0 → 14.6.2osvUSpkg:maven/com.vaadin/vaadin-bom
Maven com.vaadin:vaadin-bom15.0.0 → 19.0.9osvUSpkg:maven/com.vaadin/vaadin-bom

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-c99r-67x4-whj6Reflected cross-site scripting in development mode handler in Vaadin 14, 15-192021-06-28ghsa · osvUS
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. - https://vaadin.com/security/cve-2021-33604

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2021-06-24modified 2026-06-17

references (7)

External citations — patches, advisories, analysis.

scry

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