CVE-2021-36021: Magento versions 2.4.2 (and earlier), 2.4.2-p1 (and earlier) and 2.3.7 (and earlier) are affected by an Improp

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HIGH 7.2UPGRADE

CVE-2021-36021 is a high-severity flaw (CVSS 7.2) affecting magento. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Magento versions 2.4.2 (and earlier), 2.4.2-p1 (and earlier) and 2.3.7 (and earlier) are affected by an Improper input validation vulnerability within the CMS page scheduled update feature. An authenticated attacker with administrative privilege could leverage this vulnerability to achieve remote code execution on the system.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	2.0% (top 19%)
CISA exploited list	No
Weakness	CWE-20
Published	2023-09-06
Last modified	2026-06-17

Publisher (CNA): Adobe Systems Incorporated · Vendor: magento

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-09-06 14:15 UTCPublished CVE record published
2026-06-17 03:58 UTCUpdated Record last modified

magento magento UPGRADE

Affected: < 2.3.7 · >= 2.4.0 and < 2.4.2 · 2.3.7 · 2.4.2 · 2.4.2 p1

Fixed in: 2.3.7, 2.4.2

Safe to downgrade to: a release before 2.3.7

1. Check installed version

apt-cache policy magento || rpm -q magento || magento --version

2. UPGRADE to 2.3.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade magento

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade magento

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.3.7 (Debian / Ubuntu)

apt-cache madison magento sudo apt install magento=<VERSION_BEFORE_2.3.7> sudo apt-mark hold magento

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list magento sudo dnf downgrade magento-<VERSION_BEFORE_2.3.7> sudo dnf versionlock add magento

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-36021?

magento: upgrade to 2.3.7, 2.4.2. Exact commands for each OS are on this page.

Is CVE-2021-36021 being exploited?

CVE-2021-36021 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-36021 affect?

CVE-2021-36021 affects magento. Severity is high (CVSS 7.2). Magento versions 2.4.2 (and earlier), 2.4.2-p1 (and earlier) and 2.3.7 (and earlier) are affected by an Improper input validation vulnerability within the CMS page scheduled update feature. An authenticated attacker with administrative priv

How urgent is CVE-2021-36021?

Priority 45/100. High severity

Software pages

Magento vulnerabilities

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References

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