Vulnerability · Published May 5, 2021 · Assigned by Vaadin

CVE-2021-31411Insecure temporary directory usage in frontend build functionality of Vaadin 14 and 15-19

Medium 6.3

In plain English

A medium-severity security flaw in flow-server from Vaadin. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.3Medium

Exploit odds (30 days)0.2%top 85.9% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Maven	com.vaadin:vaadin-bom	14.5.3	GHSA-p826-8vhq-h439
Maven	com.vaadin:vaadin-bom	19.0.5	GHSA-p826-8vhq-h439

Affected products (as reported)

Vendor	Product	Versions
Vaadin	Vaadin	14.0.3 – before *
Vaadin	flow-server	2.0.9 – before *

Weakness: CWE-379 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

References

https://vaadin.com/security/cve-2021-31411 x_refsource_CONFIRM
https://github.com/vaadin/flow/pull/10640 x_refsource_CONFIRM