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CVE-2021-31411

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

HIGH
7.8
CVSS Score
Published: May 5, 2021 at 06:15 PM UTC
Updated: June 17, 2026 at 03:51 AM UTC
3 products affected across 1 vendorVaadinFlowFlow Server

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Severity
HIGH7.8
Exploit prediction
EPSS 0.2%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Flow· Vaadinmaven
95%
2.0.9 ≤ v < 2.5.33.0.0 ≤ v ≤ 5.0.06.0.0 ≤ v ≤ 6.0.6
Affected range stops below 2.5.3, so it looks safe — our inference, not a vendor statement
Vaadin· Vaadinmaven
95%
v ≥ 14.0.314.0.3 ≤ v < 14.5.315.0.0 ≤ v < 19.0.514.0.3
Affected range stops below 14.5.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 19.0.5, so it looks safe — our inference, not a vendor statement
Flow Server· Vaadin
60%
v ≥ 2.0.92.0.9

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://github.com/vaadin/flow/pull/10640
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://vaadin.com/security/cve-2021-31411

CVSS

7.8HIGH[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-379NVD-CWE-Other

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