Interpretation Conflict in CodeIgniter4 - CVE-2025-24013
Published: January 18, 2025 / Updated: May 23, 2026
Vulnerability identifier: #VU132171
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-24013
CWE-ID: CWE-436
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: CodeIgniter
Affected software:
CodeIgniter4
CodeIgniter4
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to interpretation conflict in Header class when processing user-supplied header names and values. A remote attacker can construct deliberately malformed headers to cause a denial of service.
Malformed headers may disrupt application functionality, cause errors, or generate invalid HTTP requests. In some cases, a remote service's web application firewall may interpret such requests as malicious and block further communication with the application.
How to mitigate CVE-2025-24013
Install security update from vendor's website.