CVE-2021-22895 Security feature bypass in Nextcloud Desktop Client

What is CVE-2021-22895?

CVE-2021-22895 is a medium-severity vulnerability in Debian Debian Linux, published on 11 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-295

Which versions are affected by CVE-2021-22895?

It affects 2 products.

Products include Debian Debian Linux, Nextcloud Desktop.

How do I fix CVE-2021-22895?

Upgrade to a fixed version.

Is CVE-2021-22895 being exploited?

There is no known exploitation of CVE-2021-22895 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2021-22895, GHSA-qpgp-vf4p-wcw5, UBUNTU-CVE-2021-22895.