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CVE-2021-33604

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

2.5 LowFix available

CVE-2021-33604 is a low vulnerability (CVSS 2.5) in Flow Flow-server, published June 24, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.29%, the 21st percentile. Fixed in com.vaadin:vaadin-bom 14.6.2.

What does this mean?
Severity
2.5 LowCVSS 3.1, CVE List
Exploit chance
0.29%EPSS, 21st percentile
Exploitation
None knownNot on CISA’s or ENISA’s lists
Fixed in
14.6.2com.vaadin:vaadin-bom +3 more

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.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
High
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
None

Exploit likelihood

0.29%Down 0.1 points since Jun 25, 2021
90%50%10%1%

Affected products

Affected packages

Affected packages
PackageAffectedFixed
com.vaadin:vaadin-bom
Maven
14.0.0 to 14.6.1
14.6.2
com.vaadin:vaadin-bom
Maven
15.0.0 to 19.0.8
19.0.9
com.vaadin:vaadin-bom
Maven
14.0.0 up to 14.6.2, plus listed versions
14.0.114.0.1014.0.1114.0.1214.0.13
Show 45 moreShow less
14.0.1414.0.1514.0.214.0.314.0.414.0.514.0.614.0.714.0.814.0.914.1.014.1.114.1.1614.1.1714.1.1814.1.1914.1.214.1.2014.1.2114.1.2214.1.2314.1.2414.1.2514.1.2614.1.2714.1.2814.1.314.1.414.1.514.2.014.2.114.2.214.2.314.3.014.3.114.3.214.3.314.3.414.3.514.3.614.3.714.3.814.3.914.4.014.4.1
14.6.2
com.vaadin:vaadin-bom
Maven
15.0.0 up to 19.0.9, plus listed versions
15.0.115.0.215.0.315.0.415.0.5
Show 35 moreShow less
15.0.616.0.016.0.116.0.216.0.316.0.416.0.517.0.017.0.117.0.1017.0.1117.0.217.0.317.0.417.0.617.0.717.0.817.0.918.0.018.0.118.0.218.0.318.0.418.0.518.0.618.0.719.0.019.0.119.0.219.0.319.0.419.0.519.0.619.0.719.0.8
19.0.9

What each source reports

CVE List Score used2.5

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

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.

Record
CVE-2021-33604
CVSS 3.1
2.5 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Weakness
CWE-172
Updated
2026-11-02
EUVDEUVD-2021-13092.5

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.

Record
EUVD-2021-1309
CVSS 3.1
2.5 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-c99r-67x4-whj62.5

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

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.

Record
GHSA-c99r-67x4-whj6
CVSS 3.1
2.5 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Weakness
CWE-172
Updated
2026-11-02
NVD2.5

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.

Record
CVE-2021-33604
CVSS 3.1
2.5 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
CVSS 2.0
1.2 LowAV:L/AC:H/Au:N/C:P/I:N/A:N
Weakness
CWE-172
Updated
2026-11-02
OSV2.5

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.

Record
CVE-2021-33604
CVSS 3.1
2.5 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Updated
2026-11-08
OSVGHSA-c99r-67x4-whj62.5

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

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.

Record
GHSA-c99r-67x4-whj6
CVSS 3.1
2.5 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Weakness
CWE-172
Updated
2026-11-02

History

History
RecordedChangedSources
factsOSV
aliases, products, publishedEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

References

This page doesn't list everything

Left out here: 17 versions. The JSON record has them.

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