CVE-2021-4252

Name: CVE-2021-4252
Creator: NVD / NIST
Published: 2022-12-18T22:15:10.243+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.46%

Last modified Jun 17, 2026

CVE-2021-4252 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. A vulnerability, which was classified as problematic, has been found in WP-Ban. This issue affects the function toggle_checkbox of the file ban-options.php. EPSS estimates a 0.46% chance of exploitation in the next 30 days.

Description

A vulnerability, which was classified as problematic, has been found in WP-Ban. This issue affects the function toggle_checkbox of the file ban-options.php. The manipulation of the argument $_SERVER["HTTP_USER_AGENT"] leads to cross site scripting. The attack may be initiated remotely. The name of the patch is 13e0b1e922f3aaa3f8fcb1dd6d50200dd693fd76. It is recommended to apply a patch to fix this issue. The identifier VDB-216209 was assigned to this vulnerability.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.46%

36.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-707

Affected Software

Vendor	Product	Versions
Wp-Ban Project	Wp-Ban	< 2021-11-24

References

https://github.com/lesterchan/wp-ban/commit/13e0b1e922f3aaa3f8fcb1dd6d50200dd693fd76Patch, Third Party Advisory
https://github.com/lesterchan/wp-ban/pull/11Patch, Third Party Advisory
https://vuldb.com/?id.216209Third Party Advisory
https://github.com/lesterchan/wp-ban/commit/13e0b1e922f3aaa3f8fcb1dd6d50200dd693fd76Patch, Third Party Advisory
https://github.com/lesterchan/wp-ban/pull/11Patch, Third Party Advisory
https://vuldb.com/?id.216209Third Party Advisory

Timeline

Published: Dec 18, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4252?

How severe is CVE-2021-4252?

CVE-2021-4252 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.46% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4252?

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-2021-4252?

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

Scan your code now

Source: NVD / NIST