CVE-2021-22895

Name: CVE-2021-22895
Creator: NVD / NIST
Published: 2021-06-11T16:15:10.797+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 1.03%

Last modified Jun 17, 2026

CVE-2021-22895 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. 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.. EPSS estimates a 1.03% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.9/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

1.03%

59.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nextcloud	Desktop	< 3.1.3
Debian	Debian Linux	10.0
Debian	Debian Linux	11.0

References

https://github.com/nextcloud/desktop/pull/2926Patch, Third Party Advisory
https://github.com/nextcloud/desktop/releases/tag/v3.1.3Release Notes, Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qpgp-vf4p-wcw5Third Party Advisory
https://hackerone.com/reports/903424Exploit, Issue Tracking, Third Party Advisory
https://www.debian.org/security/2021/dsa-4974Third Party Advisory
https://github.com/nextcloud/desktop/pull/2926Patch, Third Party Advisory
https://github.com/nextcloud/desktop/releases/tag/v3.1.3Release Notes, Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qpgp-vf4p-wcw5Third Party Advisory
https://hackerone.com/reports/903424Exploit, Issue Tracking, Third Party Advisory
https://www.debian.org/security/2021/dsa-4974Third Party Advisory

Timeline

Published: Jun 11, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-22895?

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.

How severe is CVE-2021-22895?

CVE-2021-22895 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 1.03% probability of exploitation in the next 30 days.

How do I fix CVE-2021-22895?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-22895?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST