How severe is CVE-2021-21427?

CVE-2021-21427 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-21427 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21427?

CVE-2021-21427 affects Openmage Magento. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21427?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-21427 published?

CVE-2021-21427 was published on 2021-04-21 and last updated on 2026-06-17.

CVE-2021-21427

CVE-2021-21427 is a critical-severity vulnerability in Openmage Magento with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.5
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-89
Affected product: Openmage Magento
Published: 2021-04-21
Last modified: 2026-06-17

Description

Magento-lts is a long-term support alternative to Magento Community Edition (CE). A vulnerability in magento-lts versions before 19.4.13 and 20.0.9 potentially allows an administrator unauthorized access to restricted resources. This is a backport of CVE-2021-21024. The vulnerability is patched in versions 19.4.13 and 20.0.9.

Frequently asked questions

What is CVE-2021-21427?: Magento-lts is a long-term support alternative to Magento Community Edition (CE). A vulnerability in magento-lts versions before 19.4.13 and 20.0.9 potentially allows an administrator unauthorized access to restricted resources. This is a backport of CVE-2021-21024. The vulnerability is patched in versions 19.4.13 and 20.0.9.
How severe is CVE-2021-21427?: CVE-2021-21427 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-21427 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21427?: CVE-2021-21427 affects Openmage Magento. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21427?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-21427 published?: CVE-2021-21427 was published on 2021-04-21 and last updated on 2026-06-17.

References

https://github.com/OpenMage/magento-lts/security/advisories/GHSA-fvrf-9428-527m

Affected products (1)

cpe:2.3:a:openmage:magento:*:*:*:*:lts:*:*:*

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