CVE-2021-4338

404 to 301 <= 3.0.7 - Missing Authorization to Redirect Creation

6.4 Medium

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

0.62%Up 0.6 points since Jun 7, 2023

What each source reports

CVE List Score used 6.4

404 to 301 <= 3.0.7 - Missing Authorization to Redirect Creation

Record: CVE-2021-4338
CVSS 3.1: 6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-284
Updated: 2026-11-02

EUVDEUVD-2021-34165 6.4

Record: EUVD-2021-34165
CVSS 3.1: 6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-ph5r-wpp4-cgh6 6.4

The 404 to 301 plugin for WordPress is vulnerable to authorization bypass due to missing...

Record: GHSA-ph5r-wpp4-cgh6
CVSS 3.1: 6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-284, CWE-862
Updated: 2026-11-02

NVD 6.4

Record: CVE-2021-4338
CVSS 3.1: 6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-284, CWE-862
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-4338 is a medium vulnerability (CVSS 6.4) in Duckdev 404 To 301, published June 7, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.62%, the 49th percentile. No source names a fixed version.