How severe is CVE-2020-8227?

CVE-2020-8227 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-8227 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 22% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-8227?

CVE-2020-8227 affects Nextcloud Desktop. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-8227?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-8227 published?

CVE-2020-8227 was published on 2020-08-21 and last updated on 2026-06-17.

CVE-2020-8227

CVE-2020-8227 is a medium-severity vulnerability in Nextcloud Desktop with a CVSS 3.x base score of 6.8. Its EPSS exploit-prediction score of 22% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-22.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
CVSS v2: 7.1
EPSS exploit prediction: 22% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Nextcloud Desktop
Published: 2020-08-21
Last modified: 2026-06-17

Description

Missing sanitization of a server response in Nextcloud Desktop Client 2.6.4 for Linux allowed a malicious Nextcloud Server to store files outside of the dedicated sync directory.

Frequently asked questions

What is CVE-2020-8227?: Missing sanitization of a server response in Nextcloud Desktop Client 2.6.4 for Linux allowed a malicious Nextcloud Server to store files outside of the dedicated sync directory.
How severe is CVE-2020-8227?: CVE-2020-8227 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-8227 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 22% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-8227?: CVE-2020-8227 affects Nextcloud Desktop. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-8227?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-8227 published?: CVE-2020-8227 was published on 2020-08-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nextcloud:desktop:*:*:*:*:*:*:*:*

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