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CVE-2021-4338

18
FAUCET Score

CVE-2021-4338 affects the 404 to 301 plugin for WordPress, specifically versions up to and including 3.0.7. It is an authorization bypass vulnerability stemming from missing capability checks on the open_redirect and save_redirect functions. This flaw allows authenticated attackers to view, create, and edit website redirections. The vulnerability has a CVSS score of 5.4 (Medium), indicating a network-based attack with low complexity, requiring user interaction, and resulting in low confidentiality and integrity impacts. There is no evidence of active exploitation, nor are there publicly available exploit modules or proof-of-concept code. Community discussion and media coverage for this CVE are minimal.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.0.7CPE matchmatch criteria
cpe:2.3:a:duckdev:404_to_301:*:*:*:*:*:wordpress:*:*

CVSS Data

CVSS version used by this source: 3.1

6.4MEDIUM

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 Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.1
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.62%
Probability of exploitation in next 30 days
EPSS Percentile
45.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0062 is in the 76th percentile among its peer group of 15,222 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

blog.nintechnet.com / broken-access-control-vulnerability-fixed-in-wordpress-404-to-301-plugin
Exploit
plugins.trac.wordpress.org / changeset/2546695/404-to-301
Patch
wpscan.com / vulnerability/9f147107-bc5a-4a01-9979-cd9e16061f12
Third Party Advisory
acunetix.com / vulnerabilities/web/wordpress-plugin-404-to-301-redirect-log-and-notify-404-errors-security-bypass-3-0-7
Third Party Advisory
wordfence.com / threat-intel/vulnerabilities/id/05d6b27f-b1e5-4bb8-b7db-f8295a5e0d5b
Third Party Advisory