CVE Intelligence
Skip to main content
LOW

CVE-2021-33604

CVE-2021-33604 — 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.

Published Updated Sources: cvelistV5, Vaadin

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.

Exploitation

Unreported

no source claims exploitation

EPSS

0%

chance of exploitation in 30 days

Affects

vaadin

2 products listed

CVSS base

2.5

LOW

Affected scope

The catalog records vendors and products as separate lists, not pairs, so which product belongs to which vendor is not something this page can say.

Vendors (1)

vaadin

Products (2)

vaadinflow server

Every base score collected

Sources score independently and disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactSource
2.5CVSS 3.1LOW——cvelistV5

Weakness & attack patterns

  • CWE-172

Attack patterns reported against this CVE. The ATT&CK techniques below are inferred from its weakness class.

  • T1027Obfuscated Files or Information

References

2 on the record

Elsewhere on this site

  • vaadinevery CVE for this vendor
  • CWE-172other pages naming this weakness

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.