How severe is CVE-2021-31410?

CVE-2021-31410 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-31410 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-31410?

CVE-2021-31410 affects Vaadin Designer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-31410?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-31410 published?

CVE-2021-31410 was published on 2021-04-23 and last updated on 2026-06-17.

CVE-2021-31410

CVE-2021-31410 is a high-severity vulnerability in Vaadin Designer with a CVSS 3.x base score of 8.6. 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-668.

Key facts

Severity: High (CVSS 3.x base score 8.6)
CVSS v2: 5.0
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-668
Affected product: Vaadin Designer
Published: 2021-04-23
Last modified: 2026-06-17

Description

Overly relaxed configuration of frontend resources server in Vaadin Designer versions 4.3.0 through 4.6.3 allows remote attackers to access project sources via crafted HTTP request.

Frequently asked questions

What is CVE-2021-31410?: Overly relaxed configuration of frontend resources server in Vaadin Designer versions 4.3.0 through 4.6.3 allows remote attackers to access project sources via crafted HTTP request.
How severe is CVE-2021-31410?: CVE-2021-31410 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-31410 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-31410?: CVE-2021-31410 affects Vaadin Designer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-31410?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-31410 published?: CVE-2021-31410 was published on 2021-04-23 and last updated on 2026-06-17.

References

https://vaadin.com/security/cve-2021-31410

Affected products (1)

cpe:2.3:a:vaadin:designer:*:*:*:*:*:*:*:*

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