What’s Vulnerable › Vulnerabilities

CVE-2021-22895

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-11 · updated 2026-06-17
• Weakness: CWE-295

Description

Nextcloud Desktop Client before 3.3.1 is vulnerable to improper certificate validation due to lack of SSL certificate verification when using the "Register with a Provider" flow.

Affected products

• Debian Linux: 10.0, 11.0
• Desktop Client: before 3.1.3 — fixed in 3.1.3

How to fix

Upgrade to a fixed version: Desktop Client 3.1.3. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/desktop/pull/2926
• https://github.com/nextcloud/desktop/releases/tag/v3.1.3
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qpgp-vf4p-wcw5
• https://hackerone.com/reports/903424
• https://www.debian.org/security/2021/dsa-4974
• https://github.com/nextcloud/desktop/pull/2926
• https://github.com/nextcloud/desktop/releases/tag/v3.1.3
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qpgp-vf4p-wcw5
• https://hackerone.com/reports/903424
• https://www.debian.org/security/2021/dsa-4974

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