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 26% (98th 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 26% places it in the 98th 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: 26% (98th 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 26% (98th 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:*:*:*:*:*:*:*:*

More vulnerabilities in Nextcloud Desktop

CVE-2024-46958 — Critical (CVSS 9.1): In Nextcloud Desktop Client 3.13.1 through 3.13.3 on Linux, synchronized files (between the server and client) may…
CVE-2021-22879 — High (CVSS 8.8): Nextcloud Desktop Client prior to 3.1.3 is vulnerable to resource injection by way of missing validation of URLs,…
CVE-2020-8224 — High (CVSS 7.8): A code injection in Nextcloud Desktop Client 2.6.4 allowed to load arbitrary code when placing a malicious OpenSSL…
CVE-2020-8225 — High (CVSS 7.5): A cleartext storage of sensitive information in Nextcloud Desktop Client 2.6.4 gave away information about used proxies…
CVE-2021-37617 — High (CVSS 7.3): The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with a computer. The Nextcloud…
CVE-2023-28999 — Medium (CVSS 6.9): Nextcloud is an open-source productivity platform. In Nextcloud Desktop client 3.0.0 until 3.8.0, Nextcloud Android app…

All CVEs affecting Nextcloud Desktop →

Other CWE-22 (Path Traversal) vulnerabilities

CVE-2026-76606 — Critical (CVSS 10.0): Joomla Extension - fabrikar.com - Path Traversal via image element in Fabrik < 4.7.3 - ???.
CVE-2026-18051 — Critical (CVSS 10.0): The W3 Total Cache WordPress plugin before 2.10.5 does not properly validate the request path it uses to build cache…
CVE-2026-74764 — Critical (CVSS 10.0): Pandora contains a path traversal vulnerability in its TAR archive extraction functionality. When processing a…
CVE-2026-16940 — Critical (CVSS 10.0): The Custom Fields WordPress plugin before 1.5.1 does not validate a user-supplied file path before deletion, allowing…
CVE-2026-67429 — Critical (CVSS 10.0): Flyto2 Core is an execution kernel for automation and AI-agent workflows. Prior to 2.26.6, image.download and related…
CVE-2026-59555 — Critical (CVSS 10.0): Unauthenticated Arbitrary File Deletion in Participants Database <= 2.7.8.3 versions.

Browse all CWE-22 (Path Traversal) vulnerabilities →