What is the CVSS score of CVE-2021-4338?

CVE-2021-4338 has a CVSS 3.1 base score of 6.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.1%.

Is there a public PoC exploit available for CVE-2021-4338?

Yes, a public proof-of-concept exploit is available for CVE-2021-4338. Prioritise patching immediately. EPSS: 0.1%.

Is there a patch available for CVE-2021-4338?

Yes, a patch is available for CVE-2021-4338. Update the affected software to the latest version immediately.

404 To 301 CVE-2021-4338

MEDIUM

Improper Access Control (CWE-284)

2023-06-07 security@wordfence.com

WordPress Authentication Bypass 404 To 301

6.4

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.4 MEDIUM

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Patch released

Apr 08, 2026 - 17:22 nvd

Patch available

PoC Detected

Apr 08, 2026 - 17:16 vuln.today

Public exploit code

CVE Published

Jun 07, 2023 - 02:15 nvd

MEDIUM 6.4

DescriptionCVE.org

The 404 to 301 plugin for WordPress is vulnerable to authorization bypass due to missing capability checks on the open_redirect & save_redirect functions in versions up to, and including, 3.0.7. This makes it possible for authenticated attackers to view, create and edit redirections.

AnalysisAI

The 404 to 301 plugin for WordPress is vulnerable to authorization bypass due to missing capability checks on the open_redirect & save_redirect functions in versions up to, and including, 3.0.7. Rated medium severity (CVSS 6.4), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified under CWE-284. The 404 to 301 plugin for WordPress is vulnerable to authorization bypass due to missing capability checks on the open_redirect & save_redirect functions in versions up to, and including, 3.0.7. This makes it possible for authenticated attackers to view, create and edit redirections. Affected products include: Duckdev 404 To 301.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.