CVE-2010-3821

WebKit in Apple Safari before 5.0.3 on Mac OS X 10.5 through 10.6 and Windows, and before 4.1.3...

9.3 High

WebKit in Apple Safari before 5.0.3 on Mac OS X 10.5 through 10.6 and Windows, and before 4.1.3 on Mac OS X 10.4, does not properly handle the :first-letter pseudo-element in a Cascading Style Sheets (CSS) token sequence, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site.

Exploit likelihood

4.36%Down 0.9 points since Feb 4, 2022

What each source reports

NVD Score used 9.3

Record: CVE-2010-3821
CVSS 2.0: 9.3 HighAV:N/AC:M/Au:N/C:C/I:C/A:C
Weakness: CWE-119
Updated: 2026-11-02

CVE List No score

Record: CVE-2010-3821
Updated: 2026-11-02

EUVDEUVD-2010-3800 No score

Record: EUVD-2010-3800
Updated: 2026-11-03

GitHub AdvisoriesGHSA-pv83-fggg-qf73 No score

WebKit in Apple Safari before 5.0.3 on Mac OS X 10.5 through 10.6 and Windows, and before 4.1.3...

Record: GHSA-pv83-fggg-qf73
Weakness: CWE-119
Updated: 2026-11-02

OSVUBUNTU-CVE-2010-3821 No score

Record: UBUNTU-CVE-2010-3821
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`qtwebkit-source` Ubuntu:16.04:LTS	All versions, plus listed versions 2.3.2-0ubuntu102.3.2-0ubuntu11	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2010-3821 is a high vulnerability (CVSS 9.3) in Apple Safari, published November 20, 2010. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.36%, the 91st percentile. No source names a fixed version.

References

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