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🛡️ CVE-2022-21647 — codeigniter

🔴 CVSS 9.5 — Critical ✅ No Known Exploit CWE-502 OSV
9.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Deserialization of Untrusted Data in Codeigniter4

Impact

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.

Patches

Upgrade to v4.1.6 or later.

Workarounds

Do not use:

  • old() and form_helper
  • RedirectResponse::withInput() and redirect()->withInput()

References

  • [PHP Object Injection | OWASP](https://owasp.org/www-community/vulnerabilities/PHP_Object_Injection)

For more information

If you have any questions or comments about this advisory:

  • Open an issue in [codeigniter4/CodeIgniter4](https://github.com/codeigniter4/CodeIgniter4/issues)
  • Email us at [SECURITY.md](https://github.com/codeigniter4/CodeIgniter4/blob/develop/SECURITY.md)

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2022-21647 is classified as CWE-502: Deserialization of Untrusted Data. Serialised data from an untrusted source is reconstructed into objects, which can trigger code during the process.

Affected software

CVE-2022-21647 is recorded against 2 packages.

  • codeigniter
  • codeigniter4/framework (fixed in 4.1.6)

Timeline and source

Published on 6 March 2024 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from OSV.

References

github.com (Web)
github.com (Web)

Other advisories for this package

codeigniter has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-502: Deserialization of Untrusted Data) in other software:

Details

Severity CRITICAL
CVSS Score 9.5
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H
CWE CWE-502
Public Exploit ✅ No
Source OSV
Published 2024-03-06
Updated 2026-08-20
Modified 2026-06-17

Affected Packages

Software From version Fixed in
codeigniter — —
codeigniter4/framework — 4.1.6

Similar Threats

Exploit Protection

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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