CVE-2021-31403
Timing side channel vulnerability in UIDL request handler in Vaadin 7 and 8
4.0
MEDIUM
CVSS 3.1
EPSS 0.13%
Description
Non-constant-time comparison of CSRF tokens in UIDL request handler in `com.vaadin:vaadin-server` versions 7.0.0 through 7.7.23 (Vaadin 7.0.0 through 7.7.23), and 8.0.0 through 8.12.2 (Vaadin 8.0.0 through 8.12.2) allows attacker to guess a security token via timing attack - https://vaadin.com/security/cve-2021-31403
How to fix CVE-2021-31403
To remediate CVE-2021-31403, upgrade the affected package to a fixed version below.
- —upgrade to 7.7.24 or later
- —upgrade to 7.7.24 or later
Is CVE-2021-31403 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 7.0.0, < 7.7.24
- >= 7.0.0, < 7.7.24
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 |