CVE-2020-35951

Name: CVE-2020-35951
Creator: NVD / NIST
Published: 2021-01-01T04:15:13.667+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.9/10EPSS 76.33%

Last modified Jun 17, 2026

CVE-2020-35951 is a critical-severity vulnerability rated 9.9/10 on the CVSS scale. An issue was discovered in the Quiz and Survey Master plugin before 7.0.1 for WordPress. It allows users to delete arbitrary files such as wp-config.php file, which could effectively take a site offline and allow an attacker to reinstall with a WordPress instance under their control. EPSS estimates a 76.33% chance of exploitation in the next 30 days.

Description

An issue was discovered in the Quiz and Survey Master plugin before 7.0.1 for WordPress. It allows users to delete arbitrary files such as wp-config.php file, which could effectively take a site offline and allow an attacker to reinstall with a WordPress instance under their control. This occurred via qsm_remove_file_fd_question, which allowed unauthenticated deletions (even though it was only intended for a person to delete their own quiz-answer files).

Metrics

CVSS 3.1

9.9/10

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

EPSS Probability

76.33%

99.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-306

Affected Software

Vendor	Product	Versions
Expresstech	Quiz And Survey Master	< 7.0.1

References

https://wpscan.com/vulnerability/10348Exploit, Third Party Advisory
https://www.wordfence.com/blog/2020/08/critical-vulnerabilities-patched-in-quiz-and-survey-master-plugin/Exploit, Third Party Advisory
https://wpscan.com/vulnerability/10348Exploit, Third Party Advisory
https://www.wordfence.com/blog/2020/08/critical-vulnerabilities-patched-in-quiz-and-survey-master-plugin/Exploit, Third Party Advisory

Timeline

Published: Jan 1, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-35951?

How severe is CVE-2020-35951?

CVE-2020-35951 has a CVSS score of 9.9/10 (CRITICAL severity). The EPSS model estimates a 76.33% probability of exploitation in the next 30 days.

How do I fix CVE-2020-35951?

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-2020-35951?

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

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Source: NVD / NIST