CVSS 3.1
2.5 lowCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:NCVE-2021-31404
Low (2.5) in vaadin. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in com.vaadin:flow-server 1.0.14, 2.4.7, 5.0.3.
Non-constant-time comparison of CSRF tokens in UIDL request handler in com.vaadin:flow-server versions 1.0.0 through 1.0.13 (Vaadin 10.0.0 through 10.0.16), 1.1.0 prior to 2.0.0 (Vaadin 11 prior to 14), 2.0.0 through 2.4.6 (Vaadin 14.0.0 through 14.4.6), 3.0.0 prior to 5.0.0 (Vaadin 15 prior to 18), and 5.0.0 through 5.0.2 (Vaadin 18.0.0 through 18.0.5) allows attacker to guess a security token 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-xwg3-qrcg-w9x6 | Maven | com.vaadin:flow-server | >=1.0.0 <1.0.14 | 1.0.14 |
| GHSA-xwg3-qrcg-w9x6 | Maven | com.vaadin:flow-server | >=1.1.0 <2.4.7 | 2.4.7 |
| GHSA-xwg3-qrcg-w9x6 | Maven | com.vaadin:flow-server | >=3.0.0 <5.0.3 | 5.0.3 |