How severe is CVE-2021-31411?

CVE-2021-31411 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2021-31411 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-31411?

CVE-2021-31411 primarily affects Vaadin Flow. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-31411?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-31411 published?

CVE-2021-31411 was published on 2021-05-05 and last updated on 2026-06-17.

CVE-2021-31411

CVE-2021-31411 is a medium-severity vulnerability in Vaadin Flow with a CVSS 3.x base score of 6.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-379.

Key facts

Severity: Medium (CVSS 3.x base score 6.3)
CVSS v2: 4.6
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-379
Affected product: Vaadin Flow
Published: 2021-05-05
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-31411?: 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.
How severe is CVE-2021-31411?: CVE-2021-31411 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2021-31411 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-31411?: CVE-2021-31411 primarily affects Vaadin Flow. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-31411?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-31411 published?: CVE-2021-31411 was published on 2021-05-05 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:vaadin:flow:*:*:*:*:*:*:*:*
cpe:2.3:a:vaadin:vaadin:*:*:*:*:*:*:*:*

More vulnerabilities in Vaadin Flow

CVE-2021-31407 — High (CVSS 8.6): Vulnerability in OSGi integration in com.vaadin:flow-server versions 1.2.0 through 2.4.7 (Vaadin 12.0.0 through…
CVE-2021-31405 — High (CVSS 7.5): Unsafe validation RegEx in EmailField component in com.vaadin:vaadin-text-field-flow versions 2.0.4 through 2.3.2…
CVE-2021-31408 — Medium (CVSS 6.3): Authentication.logout() helper in com.vaadin:flow-client versions 5.0.0 prior to 6.0.0 (Vaadin 18), and 6.0.0 through…
CVE-2019-25027 — Medium (CVSS 6.1): Missing output sanitization in default RouteNotFoundError view in com.vaadin:flow-server versions 1.0.0 through 1.0.10…
CVE-2020-36321 — Medium (CVSS 5.9): Improper URL validation in development mode handler in com.vaadin:flow-server versions 2.0.0 through 2.4.1 (Vaadin…
CVE-2021-31412 — Medium (CVSS 5.3): Improper sanitization of path in default RouteNotFoundError view in com.vaadin:flow-server versions 1.0.0 through…

All CVEs affecting Vaadin Flow →

Other CWE-379 vulnerabilities

CVE-2024-9950 — High (CVSS 7.8): A vulnerability in Forescout SecureConnector v11.3.07.0109 on Windows allows unauthenticated user to modify…
CVE-2024-9500 — High (CVSS 7.8): A maliciously crafted DLL file when placed in temporary files and folders that are leveraged by the Autodesk Installer…
CVE-2023-6080 — High (CVSS 7.8): Lakeside Software’s SysTrack LsiAgent Installer version 10.7.8 for Windows contains a local privilege escalation…
CVE-2023-3181 — High (CVSS 7.8): The C:\Program Files (x86)\Splashtop\Splashtop Software Updater\uninst.exe process creates a folder at…
CVE-2023-37243 — High (CVSS 7.8): The C:\Windows\Temp\Agent.Package.Availability\Agent.Package.Availability.exe file is automatically launched as SYSTEM…
CVE-2023-26396 — High (CVSS 7.8): Adobe Acrobat Reader versions 23.001.20093 (and earlier) and 20.005.30441 (and earlier) are affected by a Creation of…

Browse all CWE-379 vulnerabilities →