CVE-2021-41177

Nextcloud is an open-source, self-hosted productivity platform. Prior to versions 20.0.13, 21.0.5, and 22.2.0, Nextcloud Server did not implement a database backend for rate-limiting purposes. Any component of Nextcloud using rate-limits (as as `AnonRateThrottle` or `UserRateThrottle`) was thus not rate limited on instances not having a memory cache backend configured. In the case of a default installation, this would notably include the rate-limits on the two factor codes. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5, or 22.2.0. As a workaround, enable a memory cache backend in `config.php`.

• CWE-799

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fj39-4qx4-m3f2Third Party Advisory
• https://github.com/nextcloud/server/pull/28728Patch, Third Party Advisory
• https://hackerone.com/reports/1265709Permissions Required, Third Party Advisory
• https://security.gentoo.org/glsa/202208-17Third Party Advisory
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fj39-4qx4-m3f2Third Party Advisory
• https://github.com/nextcloud/server/pull/28728Patch, Third Party Advisory
• https://hackerone.com/reports/1265709Permissions Required, Third Party Advisory
• https://security.gentoo.org/glsa/202208-17Third Party Advisory

Published

Oct 25, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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