CVE-2022-21647

Name: CVE-2022-21647
Creator: NVD / NIST
Published: 2022-01-04T20:15:07.93+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 37.67%

Last modified Jun 17, 2026

CVE-2022-21647 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. CodeIgniter is an open source PHP full-stack web framework. Deserialization of Untrusted Data was found in the `old()` function in CodeIgniter4. EPSS estimates a 37.67% chance of exploitation in the next 30 days.

Description

CodeIgniter is an open source PHP full-stack web framework. Deserialization of Untrusted Data was found in the `old()` function in CodeIgniter4. Remote attackers may inject auto-loadable arbitrary objects with this vulnerability, and possibly execute existing PHP code on the server. We are aware of a working exploit, which can lead to SQL injection. Users are advised to upgrade to v4.1.6 or later. Users unable to upgrade as advised to not use the `old()` function and form_helper nor `RedirectResponse::withInput()` and `redirect()->withInput()`.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

37.67%

98.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Codeigniter	Codeigniter	>= 4.0.0, < 4.1.6

References

https://github.com/codeigniter4/CodeIgniter4/commit/ce95ed5765256e2f09f3513e7d42790e0d6948f5Patch, Third Party Advisory
https://github.com/codeigniter4/CodeIgniter4/security/advisories/GHSA-w6jr-wj64-mc9xMitigation, Third Party Advisory
https://github.com/codeigniter4/CodeIgniter4/commit/ce95ed5765256e2f09f3513e7d42790e0d6948f5Patch, Third Party Advisory
https://github.com/codeigniter4/CodeIgniter4/security/advisories/GHSA-w6jr-wj64-mc9xMitigation, Third Party Advisory

Timeline

Published: Jan 4, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-21647?

How severe is CVE-2022-21647?

CVE-2022-21647 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 37.67% probability of exploitation in the next 30 days.

How do I fix CVE-2022-21647?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-21647?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST