What is CVE-2021-31407?

CVE-2021-31407 is a high-severity vulnerability in Vaadin Flow, classified under CWE-402. CVSS score: 8.6/10. Published 2021-04-23.

How severe is CVE-2021-31407?

High severity. CVSS v3 base score is 8.6 out of 10.

Vulnerability in Vaadin Flow

CVE-2021-31407

Vulnerability in OSGi integration in com.vaadin:flow-server versions 1.2.0 through 2.4.7 (Vaadin 12.0.0 through 14.4.9), and 6.0.0 through 6.0.1 (Vaadin 19.0.0) allows attacker to access application classes and resources on the server via crafted HTTP request.

Published 2021-04-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.024 (83.6th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 83.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.024 · newest: 0.024 · change: 0.000

Affected products

Vaadin Flow
Vaadin Flow-Server — versions 1.2.0
Vaadin — versions 19.0.0, 12.0.0

Weakness classification (CWE)

References

vaadin.com/security/cve-2021-31407 (Vendor Advisory)
github.com/vaadin/osgi/issues/50 (Patch, Third Party Advisory)
github.com/vaadin/flow/pull/10229 (Patch, Third Party Advisory)
github.com/vaadin/flow/pull/10269 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-31407?: CVE-2021-31407 is a high-severity vulnerability in Vaadin Flow, classified under CWE-402. CVSS score: 8.6/10. Published 2021-04-23.
How severe is CVE-2021-31407?: High severity. CVSS v3 base score is 8.6 out of 10.