What is CVE-2021-31408?

CVE-2021-31408 is a medium-severity vulnerability in Vaadin Flow, classified under Insufficient Session Expiration. CVSS score: 6.3/10. Published 2021-04-23.

How severe is CVE-2021-31408?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Vulnerability in Vaadin Flow

CVE-2021-31408

Authentication.logout() helper in com.vaadin:flow-client versions 5.0.0 prior to 6.0.0 (Vaadin 18), and 6.0.0 through 6.0.4 (Vaadin 19.0.0 through 19.0.3) uses incorrect HTTP method, which, in combination with Spring Security CSRF protection, allows local attackers to access Fusion endpoints after the user attempted to log out.

EPSS: 0.003 (24.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.

Affected products

Vaadin Flow
Vaadin Flow-client — versions 5.0.0
Vaadin — versions 18.0.0

Weakness classification (CWE)

CWE-613 — Insufficient Session Expiration

References

security@vaadin.com (x_refsource_MISC, Vendor Advisory)
security@vaadin.com (Patch, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-31408?: CVE-2021-31408 is a medium-severity vulnerability in Vaadin Flow, classified under Insufficient Session Expiration. CVSS score: 6.3/10. Published 2021-04-23.
How severe is CVE-2021-31408?: Medium severity. CVSS v3 base score is 6.3 out of 10.