CVE-2021-31411

mediumpriority · track · 31EPSS 0.002 · 14 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.23% (14th) EPSS

CVSS 4.6 · medium

Is it mine?

9 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.6–7.8

v2.04.6mediumAV:L/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 3.9 · impact 6.4

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.8 · impact 5.9

v3.16.3mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Nsecondary · ENISA EU

v3.16.3mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Nsecondary · security@vaadin.comexploitability 1 · impact 5.2

v3.16.3mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Nsecondary · OSV

v3.17.1highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-379USCWE-379US

affected products (9)

Products and version ranges known to be affected.

Vaadin Vaadin14.0.3 → *enisa_euvdEU
Vaadin flow-server2.0.9 → *enisa_euvdEU
vaadin flow2.0.9 → 2.5.3nvdUScpe:2.3:a:vaadin:flow:*:*:*:*:*:*:*:*
vaadin flow3.0.0 → 5.0.0nvdUScpe:2.3:a:vaadin:flow:*:*:*:*:*:*:*:*
vaadin flow6.0.0 → 6.0.6nvdUScpe:2.3:a:vaadin:flow:*:*:*:*:*:*:*:*
vaadin vaadin14.0.3 → 14.5.3nvdUScpe:2.3:a:vaadin:vaadin:*:*:*:*:*:*:*:*
vaadin vaadin15.0.0 → 19.0.5nvdUScpe:2.3:a:vaadin:vaadin:*:*:*:*:*:*:*:*
Maven com.vaadin:vaadin-bom14.0.3 → 14.5.3osvUSpkg:maven/com.vaadin/vaadin-bom
Maven com.vaadin:vaadin-bom15.0.0 → 19.0.5osvUSpkg:maven/com.vaadin/vaadin-bom

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-p826-8vhq-h439Insecure temporary directory usage in frontend build functionality of Vaadin 14 and 15-192021-05-06ghsa · osvUS
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. - https://vaadin.com/security/cve-2021-31411

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2021-05-05modified 2026-06-17

references (7)

External citations — patches, advisories, analysis.

scry

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