CVE-2021-31406
Timing side channel vulnerability in endpoint request handler in Vaadin 15-19
4.0
MEDIUM
CVSS 3.1
EPSS 0.05%
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. - https://vaadin.com/security/cve-2021-31406
How to fix CVE-2021-31406
To remediate CVE-2021-31406, upgrade the affected package to a fixed version below.
- —upgrade to 5.0.4 or later
Is CVE-2021-31406 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 3.0.0, < 5.0.4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.0 | CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N |