Vulnerability · Published Jun 11, 2021 · Assigned by hackerone
CVE-2021-22895
Medium 5.9
In plain English
A medium-severity improper certificate validation in Nextcloud Desktop Client. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 64% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)5.9Medium
Exploit odds (30 days)1.0%top 35.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | nextcloud-desktop | 3.3.1-1 | DEBIAN-CVE-2021-22895 |
| Debian:13 | nextcloud-desktop | 3.3.1-1 | DEBIAN-CVE-2021-22895 |
| Debian:14 | nextcloud-desktop | 3.3.1-1 | DEBIAN-CVE-2021-22895 |
| Ubuntu:22.04:LTS | nextcloud-desktop | no fix listed | UBUNTU-CVE-2021-22895 |
| Ubuntu:24.04:LTS | nextcloud-desktop | no fix listed | UBUNTU-CVE-2021-22895 |
| Ubuntu:25.10 | nextcloud-desktop | no fix listed | UBUNTU-CVE-2021-22895 |
| Ubuntu:26.04:LTS | nextcloud-desktop | no fix listed | UBUNTU-CVE-2021-22895 |
| Ubuntu:26.10 | nextcloud-desktop | no fix listed | UBUNTU-CVE-2021-22895 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| n/a | Nextcloud Desktop Client | Fixed in 3.3.1 |
Weakness: CWE-295
References
- https://hackerone.com/reports/903424 x_refsource_MISC
- https://github.com/nextcloud/desktop/pull/2926 x_refsource_MISC
- https://github.com/nextcloud/desktop/releases/tag/v3.1.3 x_refsource_MISC
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qpgp-vf4p-wcw5 x_refsource_MISC
- DSA-4974 vendor-advisory, x_refsource_DEBIAN