CVSS 3.1
2.5 lowCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:NCVE-2021-31406
Low (2.5) in vaadin. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in com.vaadin:flow-server 5.0.4, 6.0.1.
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.
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 11% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-203, CWE-208
- Published
- Modified
- Record from
- the NVD, synced
Affected
- vaadin:flow
- vaadin:vaadin
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-p7jq-v8jp-j424 | Maven | com.vaadin:flow-server | >=3.0.0 <5.0.4 | 5.0.4 |
| GHSA-p7jq-v8jp-j424 | Maven | com.vaadin:flow-server | >=6.0.0 <6.0.1 | 6.0.1 |