CVE-2021-24171

Name: CVE-2021-24171
Creator: NVD / NIST
Published: 2021-04-05T19:15:15.857+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.90%

Last modified Jun 17, 2026

CVE-2021-24171 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The WooCommerce Upload Files WordPress plugin before 59.4 ran a single sanitization pass to remove blocked extensions such as .php. It was possible to bypass this and upload a file with a PHP extension by embedding a "blocked" extension within another "blocked" extension in the "wcuf_file_name" parameter. EPSS estimates a 1.90% chance of exploitation in the next 30 days.

Description

The WooCommerce Upload Files WordPress plugin before 59.4 ran a single sanitization pass to remove blocked extensions such as .php. It was possible to bypass this and upload a file with a PHP extension by embedding a "blocked" extension within another "blocked" extension in the "wcuf_file_name" parameter. It was also possible to perform a double extension attack and upload files to a different location via path traversal using the "wcuf_current_upload_session_id" parameter.

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

1.90%

77.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Vanquish	Woocommerce Upload Files	< 59.4

References

https://wpscan.com/vulnerability/ed4288a1-f7e4-455f-b765-5ac343f87194Third Party Advisory
https://www.wordfence.com/blog/2021/03/critical-vulnerability-patched-in-woocommerce-upload-files/Third Party Advisory
https://wpscan.com/vulnerability/ed4288a1-f7e4-455f-b765-5ac343f87194Third Party Advisory
https://www.wordfence.com/blog/2021/03/critical-vulnerability-patched-in-woocommerce-upload-files/Third Party Advisory

Timeline

Published: Apr 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-24171?

How severe is CVE-2021-24171?

CVE-2021-24171 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.90% probability of exploitation in the next 30 days.

How do I fix CVE-2021-24171?

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-2021-24171?

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

Scan your code now

Source: NVD / NIST