CVE-2021-32678: Fedoraproject Fedora

Medium severity, CVSS 5.3. EPSS: 1.4% chance of exploitation in the next 30 days.

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.0.11, and 21.0.3, ratelimits are not applied to OCS API responses. This affects any OCS API controller (`OCSController`) using the `@BruteForceProtection` annotation. Risk depends on the installed applications on the Nextcloud Server, but could range from bypassing authentication ratelimits or spamming other Nextcloud users. The vulnerability is patched in versions 19.0.13, 20.0.11, and 21.0.3. No workarounds aside from upgrading are known to exist.

Affected products

• Fedoraproject Fedora: version 33 only; version 34 only
• Nextcloud Nextcloud Server: before 19.0.13 (fixed in 19.0.13); from 20.0.0, before 20.0.11 (fixed in 20.0.11); from 21.0.0, before 21.0.3 (fixed in 21.0.3)

Published 2021-07-12. Last modified 2026-06-17.