How severe is CVE-2020-20287?

CVE-2020-20287 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-20287 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-20287?

CVE-2020-20287 affects Yccms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-20287?

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-2020-20287 published?

CVE-2020-20287 was published on 2021-02-01 and last updated on 2026-06-17.

CVE-2020-20287

CVE-2020-20287 is a critical-severity vulnerability in Yccms with a CVSS 3.x base score of 9.8. 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: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Yccms
Published: 2021-02-01
Last modified: 2026-06-17

Description

Unrestricted file upload vulnerability in the yccms 3.3 project. The xhUp function's improper judgment of the request parameters, triggers remote code execution.

Frequently asked questions

What is CVE-2020-20287?: Unrestricted file upload vulnerability in the yccms 3.3 project. The xhUp function's improper judgment of the request parameters, triggers remote code execution.
How severe is CVE-2020-20287?: CVE-2020-20287 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-20287 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-20287?: CVE-2020-20287 affects Yccms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-20287?: 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-2020-20287 published?: CVE-2020-20287 was published on 2021-02-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:yccms:yccms:3.3:*:*:*:*:*:*:*

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