How severe is CVE-2010-1421?

CVE-2010-1421 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2010-1421 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2010-1421?

CVE-2010-1421 primarily affects Apple Safari. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2010-1421?

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

When was CVE-2010-1421 published?

CVE-2010-1421 was published on 2010-06-11 and last updated on 2026-06-16.

CVE-2010-1421

CVE-2010-1421 is a medium-severity vulnerability in Apple Safari 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.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Apple Safari
Published: 2010-06-11
Last modified: 2026-06-16

Description

The execCommand JavaScript function in WebKit in Apple Safari before 5.0 on Mac OS X 10.5 through 10.6 and Windows, and before 4.1 on Mac OS X 10.4, does not properly restrict remote execution of clipboard commands, which allows remote attackers to modify the clipboard via a crafted HTML document.

Frequently asked questions

What is CVE-2010-1421?: The execCommand JavaScript function in WebKit in Apple Safari before 5.0 on Mac OS X 10.5 through 10.6 and Windows, and before 4.1 on Mac OS X 10.4, does not properly restrict remote execution of clipboard commands, which allows remote attackers to modify the clipboard via a crafted HTML document.
How severe is CVE-2010-1421?: CVE-2010-1421 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2010-1421 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2010-1421?: CVE-2010-1421 primarily affects Apple Safari. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2010-1421?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2010-1421 published?: CVE-2010-1421 was published on 2010-06-11 and last updated on 2026-06-16.

References

Affected products (8)

cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*
cpe:2.3:a:apple:safari:4.0:*:*:*:*:*:*:*
cpe:2.3:a:apple:safari:4.0.0b:*:*:*:*:*:*:*
cpe:2.3:a:apple:safari:4.0.1:*:*:*:*:*:*:*
cpe:2.3:a:apple:safari:4.0.2:*:*:*:*:*:*:*
cpe:2.3:a:apple:safari:4.0.3:*:*:*:*:*:*:*
cpe:2.3:a:apple:safari:4.0.4:*:*:*:*:*:*:*
cpe:2.3:a:apple:webkit:*:*:*:*:*:*:*:*

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