Vulnerability in Vaadin Flow
CVE-2021-31406
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (10.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 10.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Vaadin Flow — versions 6.0.0
- Vaadin Flow-Server — versions 6.0.0, 3.0.0
- Vaadin — versions 19.0.0, 15.0.0
Weakness classification (CWE)
References
- vaadin.com/security/cve-2021-31406 (Vendor Advisory)
- github.com/vaadin/flow/pull/10157 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-31406?
- CVE-2021-31406 is a medium-severity vulnerability in Vaadin Flow, classified under CWE-208. CVSS score: 4.0/10. Published 2021-04-23.
- How severe is CVE-2021-31406?
- Medium severity. CVSS v3 base score is 4.0 out of 10.