How severe is CVE-2021-21427?

CVE-2021-21427 has a CVSS score of 7.2/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2021-21427?

CVE-2021-21427 affects the following packages: openmage/magento-lts (Packagist), openmage/magento-lts (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2021-21427?

Update openmage/magento-lts to 19.4.13 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-21427 is resolved across your whole dependency graph.

How do I detect CVE-2021-21427 in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for openmage/magento-lts, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2021-21427 if there is no patch (or I can't update yet)?

Until you can upgrade, make sure every query built from user input uses parameterised statements or a prepared-statement API rather than string concatenation, and reduce the database account's privileges so an injected query cannot read or alter data beyond what the feature needs.

Is CVE-2021-21427 actively exploited in the wild?

No public exploit code has been indexed for CVE-2021-21427 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2021-21427?

CVE-2021-21427 has an EPSS (Exploit Prediction Scoring System) score of 1.1%, placing it in the 64th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2021-21427?

CVE-2021-21427 is classified as SQL Injection (CWE-89). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2021-21427 published, and has it been updated?

CVE-2021-21427 was published on April 21, 2021 and was last updated on August 7, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘

🐘 Packagist

Not in CISA KEV

HIGH severity

CVE-2021-21427 — magento-lts

HIGH

CVE-2021-21427 is a high-severity (CVSS 7.2) SQL Injection vulnerability in openmage/magento-lts. A fix is available for openmage/magento-lts — see the affected versions and patch details below.

Backport for CVE-2021-21024 Blind SQLi from Magento 2

Also known asGHSA-fvrf-9428-527m

Published

Apr 21, 2021

Updated

Aug 7, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

1.1%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs64th percentile — riskier than 64% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-21427 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

2 pkgs affected

🐘openmage/magento-lts🐘openmage/magento-lts

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Impact

This vulnerability allows an administrator unauthorized access to restricted resources.

We fixed a vulnerability in the MySQL adapter to prevent SQL injection attacks. This is a backport of CVE-2021-21024 https://helpx.adobe.com/security/products/magento/apsb21-08.html.

Patches

Has the problem been patched? What versions should users upgrade to?

v20.0.9 v19.4.13

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`openmage/magento-lts`	all versions	19.4.13`composer require openmage/magento-lts:^19.4.13`
🐘Packagist	`openmage/magento-lts`	≥ 20.0.0&&< 20.0.9	20.0.9`composer require openmage/magento-lts:^20.0.9`

Affected Products

1 product · 2 configurations

Application

magentoopenmage

≥ 20.0.0 && < 20.0.9

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for openmage/magento-lts, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update openmage/magento-lts to 19.4.13 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-21427 is resolved across your whole dependency graph.
Workarounds
Until you can upgrade, make sure every query built from user input uses parameterised statements or a prepared-statement API rather than string concatenation, and reduce the database account's privileges so an injected query cannot read or alter data beyond what the feature needs.

Frequently Asked Questions

### Impact This vulnerability allows an administrator unauthorized access to restricted resources. We fixed a vulnerability in the MySQL adapter to prevent SQL injection attacks. This is a backport of CVE-2021-21024 https://helpx.adobe.com/security/products/magento/apsb21-08.html. ### Patches _Has the problem been patched? What versions should users upgrade to?_ > v20.0.9 v19.4.13

O3 Security · Impact-Aware SCA

Is CVE-2021-21427 in your dependencies?

Find it across Packagist, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

7.2/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Raw vector

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

CWE Classification

CWE-89SQL Injection

Weaponization

No known public exploit tooling found.

OpenSSF Scorecard

Package health score

magento-lts

6.2/10

Maintained10/10

Code-Review10/10

Branch-Protection2/10

Assessed Oct 5, 2026

Timeline

Disclosed

Apr 21, 2021

Last updated

Aug 7, 2026

Identifiers

CVE-2021-21427

GHSA-fvrf-9428-527m

References

Advisorygithub.com Advisorynvd.nist.gov

Related vulnerabilities

This CVE is high severity; 3 of 8 other CVEs affecting openmage/magento-lts are rated as high or higher (top: critical).

CVE-2026-42458CVE-2026-42155CVE-2026-42207CVE-2026-40488CVE-2026-40098CVE-2026-25525CVE-2026-25524CVE-2026-25523

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedAug 7, 2026

CVE-2021-21427 — magento-lts

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Impact

Patches

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Frequently Asked Questions

Is CVE-2021-21427 in your dependencies?