CVE-2021-31411

Name: CVE-2021-31411
Creator: NVD / NIST
Published: 2021-05-05T19:15:08.777+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.23%

Last modified Jun 17, 2026

CVE-2021-31411 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Insecure temporary directory usage in frontend build functionality of com.vaadin:flow-server versions 2.0.9 through 2.5.2 (Vaadin 14.0.3 through Vaadin 14.5.2), 3.0 prior to 6.0 (Vaadin 15 prior to 19), and 6.0.0 through 6.0.5 (Vaadin 19.0.0 through 19.0.4) allows local users to inject malicious code into frontend resources during application rebuilds.. EPSS estimates a 0.23% chance of exploitation in the next 30 days.

Description

Insecure temporary directory usage in frontend build functionality of com.vaadin:flow-server versions 2.0.9 through 2.5.2 (Vaadin 14.0.3 through Vaadin 14.5.2), 3.0 prior to 6.0 (Vaadin 15 prior to 19), and 6.0.0 through 6.0.5 (Vaadin 19.0.0 through 19.0.4) allows local users to inject malicious code into frontend resources during application rebuilds.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.23%

13.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-379

Affected Software

Vendor	Product	Versions
Vaadin	Flow	>= 2.0.9, < 2.5.3
Vaadin	Flow	>= 3.0.0, <= 5.0.0
Vaadin	Flow	>= 6.0.0, <= 6.0.6
Vaadin	Vaadin	>= 14.0.3, < 14.5.3
Vaadin	Vaadin	>= 15.0.0, < 19.0.5

References

https://github.com/vaadin/flow/pull/10640Patch, Third Party Advisory
https://vaadin.com/security/cve-2021-31411Vendor Advisory
https://github.com/vaadin/flow/pull/10640Patch, Third Party Advisory
https://vaadin.com/security/cve-2021-31411Vendor Advisory

Timeline

Published: May 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31411?

How severe is CVE-2021-31411?

CVE-2021-31411 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.23% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31411?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-31411?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST