CVE-2021-24223

Name: CVE-2021-24223
Creator: NVD / NIST
Published: 2021-04-12T14:15:15.697+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.21%

Last modified Jun 17, 2026

CVE-2021-24223 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The N5 Upload Form WordPress plugin through 1.0 suffers from an arbitrary file upload issue in page where a Form from the plugin is embed, as any file can be uploaded. The uploaded filename might be hard to guess as it's generated with md5(uniqid(rand())), however, in the case of misconfigured servers with Directory listing enabled, accessing it is trivial.. EPSS estimates a 2.21% chance of exploitation in the next 30 days.

Description

The N5 Upload Form WordPress plugin through 1.0 suffers from an arbitrary file upload issue in page where a Form from the plugin is embed, as any file can be uploaded. The uploaded filename might be hard to guess as it's generated with md5(uniqid(rand())), however, in the case of misconfigured servers with Directory listing enabled, accessing it is trivial.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

2.21%

80.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
N5 Upload Form Project	N5 Upload Form	<= 1.0

References

https://github.com/jinhuang1102/CVE-ID-Reports/blob/12863f80ced5361e2e2c3f7209566ab3730aa37b/N5_upload.mdExploit, Third Party Advisory
https://wpscan.com/vulnerability/d7a72183-0cd1-45de-b98b-2e295b27e5dbExploit, Third Party Advisory
https://github.com/jinhuang1102/CVE-ID-Reports/blob/12863f80ced5361e2e2c3f7209566ab3730aa37b/N5_upload.mdExploit, Third Party Advisory
https://wpscan.com/vulnerability/d7a72183-0cd1-45de-b98b-2e295b27e5dbExploit, Third Party Advisory

Timeline

Published: Apr 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-24223?

How severe is CVE-2021-24223?

CVE-2021-24223 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.21% probability of exploitation in the next 30 days.

How do I fix CVE-2021-24223?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-24223?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST