CVE-2021-31407

mediumpriority · track · 31EPSS 0.024 · 84 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

2.38% (84th) EPSS

CVSS 5 · medium

Is it mine?

9 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

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.

cvss

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

8.6

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–8.6

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.18.6highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:Nsecondary · ENISA EU

v3.18.6highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:Nsecondary · security@vaadin.comexploitability 3.9 · impact 4

v3.18.6highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:Nsecondary · OSV

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-668USprimaryCWE-402USCWE-402USCWE-668US

affected products (9)

Products and version ranges known to be affected.

Vaadin Vaadin≤ 19.0.0enisa_euvdEU
Vaadin Vaadin12.0.0 → *enisa_euvdEU
Vaadin flow-server1.2.0 → *enisa_euvdEU
vaadin flow1.2.0 → 2.4.8nvdUScpe:2.3:a:vaadin:flow:*:*:*:*:*:*:*:*
vaadin flow6.0.0 → 6.0.2nvdUScpe:2.3:a:vaadin:flow:*:*:*:*:*:*:*:*
vaadin vaadin12.0.0 → 14.4.10nvdUScpe:2.3:a:vaadin:vaadin:*:*:*:*:*:*:*:*
vaadin vaadin= 19.0.0nvdUScpe:2.3:a:vaadin:vaadin:*:*:*:*:*:*:*:*
Maven com.vaadin:flow-server1.2.0 → 2.4.8osvUSpkg:maven/com.vaadin/flow-server
Maven com.vaadin:flow-server6.0.0 → 6.0.1osvUSpkg:maven/com.vaadin/flow-server

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-25xc-jwfq-39jwOSGi applications using Vaadin 12-14 and 19 vulnerable to server classes and resources exposure2021-04-19ghsa · osvUS
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. - https://vaadin.com/security/cve-2021-31407

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 2021-04-23modified 2026-06-17

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references (13)

External citations — patches, advisories, analysis.

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