CVE-2021-20717

Name: CVE-2021-20717
Creator: NVD / NIST
Published: 2021-05-10T10:15:07.313+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 2.31%

Last modified Jun 17, 2026

CVE-2021-20717 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Cross-site scripting vulnerability in EC-CUBE 4.0.0 to 4.0.5 allows a remote attacker to inject a specially crafted script in the specific input field of the EC web site which is created using EC-CUBE. As a result, it may lead to an arbitrary script execution on the administrator's web browser.. EPSS estimates a 2.31% chance of exploitation in the next 30 days.

Description

Cross-site scripting vulnerability in EC-CUBE 4.0.0 to 4.0.5 allows a remote attacker to inject a specially crafted script in the specific input field of the EC web site which is created using EC-CUBE. As a result, it may lead to an arbitrary script execution on the administrator's web browser.

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

2.31%

81.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Ec-Cube	Ec-Cube	>= 4.0.0, < 4.0.5

References

https://jvn.jp/en/jp/JVN97554111/index.htmlThird Party Advisory
https://www.ec-cube.net/news/detail.php?news_id=383Patch, Vendor Advisory
https://www.ec-cube.net/news/detail.php?news_id=384Patch, Vendor Advisory
https://jvn.jp/en/jp/JVN97554111/index.htmlThird Party Advisory
https://www.ec-cube.net/news/detail.php?news_id=383Patch, Vendor Advisory
https://www.ec-cube.net/news/detail.php?news_id=384Patch, Vendor Advisory

Timeline

Published: May 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20717?

How severe is CVE-2021-20717?

CVE-2021-20717 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 2.31% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20717?

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-2021-20717?

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

Scan your code now

Source: NVD / NIST