CVE-2021-20751

Name: CVE-2021-20751
Creator: NVD / NIST
Published: 2021-06-28T01:15:07.603+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.09%

Last modified Jun 17, 2026

CVE-2021-20751 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Cross-site scripting vulnerability in EC-CUBE EC-CUBE 4.0.0 to 4.0.5-p1 (EC-CUBE 4 series) allows a remote attacker to inject an arbitrary script by leading an administrator or a user to a specially crafted page and to perform a specific operation.. EPSS estimates a 1.09% chance of exploitation in the next 30 days.

Description

Cross-site scripting vulnerability in EC-CUBE EC-CUBE 4.0.0 to 4.0.5-p1 (EC-CUBE 4 series) allows a remote attacker to inject an arbitrary script by leading an administrator or a user to a specially crafted page and to perform a specific operation.

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

1.09%

61.1th 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
Ec-Cube	Ec-Cube	4.0.5.

References

https://jvn.jp/en/jp/JVN95292458/index.htmlThird Party Advisory
https://www.ec-cube.net/info/weakness/weakness.php?id=78Vendor Advisory
https://jvn.jp/en/jp/JVN95292458/index.htmlThird Party Advisory
https://www.ec-cube.net/info/weakness/weakness.php?id=78Vendor Advisory

Timeline

Published: Jun 28, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20751?

How severe is CVE-2021-20751?

CVE-2021-20751 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.09% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20751?

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-2021-20751?

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

Scan your code now

Source: NVD / NIST