VULNERABILITY INTELLIGENCE

CVE-2021-31406

CVSS score4 MEDIUM

EPSS probability0.21%

CISA KEVNot currently listed

Published2021-04-23

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Description

Non-constant-time comparison of CSRF tokens in endpoint request handler in com.vaadin:flow-server versions 3.0.0 through 5.0.3 (Vaadin 15.0.0 through 18.0.6), and com.vaadin:fusion-endpoint version 6.0.0 (Vaadin 19.0.0) allows attacker to guess a security token for Fusion endpoints via timing attack.

Weakness classification

security@vaadin.com: CWE-208
nvd@nist.gov: CWE-203

Primary references

security@vaadin.com — Patch, Third Party Advisory
security@vaadin.com — Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Vendor Advisory