CVE-2021-24221

Name: CVE-2021-24221
Creator: NVD / NIST
Published: 2021-04-12T14:15:15.57+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.89%

Last modified Jun 17, 2026

CVE-2021-24221 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. The Quiz And Survey Master – Best Quiz, Exam and Survey Plugin for WordPress plugin before 7.1.12 did not sanitise the result_id GET parameter on pages with the [qsm_result] shortcode without id attribute, concatenating it in a SQL statement and leading to an SQL injection. The lowest role allowed to use this shortcode in post or pages being author, such user could gain unauthorised access to the DBMS. EPSS estimates a 1.89% chance of exploitation in the next 30 days.

Description

The Quiz And Survey Master – Best Quiz, Exam and Survey Plugin for WordPress plugin before 7.1.12 did not sanitise the result_id GET parameter on pages with the [qsm_result] shortcode without id attribute, concatenating it in a SQL statement and leading to an SQL injection. The lowest role allowed to use this shortcode in post or pages being author, such user could gain unauthorised access to the DBMS. If the shortcode (without the id attribute) is embed on a public page or post, then unauthenticated users could exploit the injection.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

1.89%

77.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-89

Affected Software

Vendor	Product	Versions
Expresstech	Quiz And Survey Master	< 7.1.12

References

https://plugins.trac.wordpress.org/changeset/2479603/Patch, Third Party Advisory
https://wpscan.com/vulnerability/3b52b25c-82a1-41c7-83ac-92e244f7c5abExploit, Third Party Advisory
https://plugins.trac.wordpress.org/changeset/2479603/Patch, Third Party Advisory
https://wpscan.com/vulnerability/3b52b25c-82a1-41c7-83ac-92e244f7c5abExploit, Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-24221?

How severe is CVE-2021-24221?

CVE-2021-24221 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.89% probability of exploitation in the next 30 days.

How do I fix CVE-2021-24221?

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-2021-24221?

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

Scan your code now

Source: NVD / NIST