Is CVE-2022-21647 actively exploited?

No active exploitation of CVE-2022-21647 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2022-21647 be exploited remotely?

Yes. CVE-2022-21647 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2022-21647?

CVE-2022-21647 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2022-21647

CWE-502Published: January 4, 2022· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official 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()`.

NVD Source

Technical Analysis

CVE-2022-21647 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-502): Insecure deserialization vulnerabilities allow attackers to inject malicious objects during deserialization, potentially enabling remote code execution.