CVE-2021-21020 Magento Commerce Improper Access Control Vulnerability

What is CVE-2021-21020?

CVE-2021-21020 is a medium-severity authentication bypass vulnerability in Magento Magento, published on 11 Feb 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Magento versions 2.4.1 (and earlier), 2.4.0-p1 (and earlier) and 2.3.6 (and earlier) are vulnerable to an access control bypass vulnerability in the Login as Customer module. Successful exploitation could lead to unauthorized access to restricted resources.

Weakness: CWE-284

Which versions are affected by CVE-2021-21020?

7 open source packages ship an affected version, including magento/community-edition, magento and magento/project-community-edition. It affects 1 product.

Products include Magento Magento.

How do I fix CVE-2021-21020?

Upgrade magento/community-edition to a fixed version for your release line: 2.3.6 or 2.4.1-p1.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2021-21020 being exploited?

There is no known exploitation of CVE-2021-21020 in the wild and no public exploit code.

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• CVE-2020-9578 Magento command injection vulnerability Critical 9.8
• CVE-2020-9579 Magento Security mitigation bypass vulnerability Critical 9.8
• CVE-2020-9580 Magento Security mitigation bypass vulnerability Critical 9.8

All Magento Magento vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-magento-2021-21020, GHSA-2j6v-829g-885q.