Vulnerability in Vaadin Flow
CVE-2021-31404
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.
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 (10.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 10.5% 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
- Vaadin Flow-Server — versions 1.0.0
- Vaadin — versions 10.0.0
Weakness classification (CWE)
References
- vaadin.com/security/cve-2021-31404 (Vendor Advisory)
- github.com/vaadin/flow/pull/9875 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-31404?
- CVE-2021-31404 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-2021-31404?
- Medium severity. CVSS v3 base score is 4.0 out of 10.