How severe is CVE-2020-21564?

CVE-2020-21564 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-21564 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-21564?

CVE-2020-21564 primarily affects Pluck-cms Pluck. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-21564?

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

When was CVE-2020-21564 published?

CVE-2020-21564 was published on 2020-09-30 and last updated on 2026-06-17.

CVE-2020-21564

CVE-2020-21564 is a high-severity vulnerability in Pluck-cms Pluck with a CVSS 3.x base score of 8.8. 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-434.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 3% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Pluck-cms Pluck
Published: 2020-09-30
Last modified: 2026-06-17

Description

An issue was discovered in Pluck CMS 4.7.10-dev2 and 4.7.11. There is a file upload vulnerability that can cause a remote command execution via admin.php?action=files.

Frequently asked questions

What is CVE-2020-21564?: An issue was discovered in Pluck CMS 4.7.10-dev2 and 4.7.11. There is a file upload vulnerability that can cause a remote command execution via admin.php?action=files.
How severe is CVE-2020-21564?: CVE-2020-21564 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-21564 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-21564?: CVE-2020-21564 primarily affects Pluck-cms Pluck. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-21564?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-21564 published?: CVE-2020-21564 was published on 2020-09-30 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:pluck-cms:pluck:4.7.10:dev2:*:*:*:*:*:*
cpe:2.3:a:pluck-cms:pluck:4.7.11:*:*:*:*:*:*:*

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