How severe is CVE-2011-0509?

CVE-2011-0509 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2011-0509 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-0509?

CVE-2011-0509 affects Vaadin. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2011-0509?

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

When was CVE-2011-0509 published?

CVE-2011-0509 was published on 2011-01-20 and last updated on 2026-06-16.

CVE-2011-0509

CVE-2011-0509 is a medium-severity vulnerability in Vaadin with a CVSS 2.0 base score of 4.3. 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-79.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Vaadin
Published: 2011-01-20
Last modified: 2026-06-16

Description

Cross-site scripting (XSS) vulnerability in Vaadin before 6.4.9 allows remote attackers to inject arbitrary web script or HTML via unknown vectors related to the index page.

Frequently asked questions

What is CVE-2011-0509?: Cross-site scripting (XSS) vulnerability in Vaadin before 6.4.9 allows remote attackers to inject arbitrary web script or HTML via unknown vectors related to the index page.
How severe is CVE-2011-0509?: CVE-2011-0509 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2011-0509 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-0509?: CVE-2011-0509 affects Vaadin. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2011-0509?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-0509 published?: CVE-2011-0509 was published on 2011-01-20 and last updated on 2026-06-16.

References

Affected products (1)

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

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