CVE-2021-32678

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.

• CWE-799
• CWE-307

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-48rx-3gmf-g74jThird Party Advisory
• https://github.com/nextcloud/server/pull/27329Patch, Third Party Advisory
• https://hackerone.com/reports/1214158Permissions Required
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BVZS26RDME2DYTKET5AECRIZDFUGR2AZ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J63NBVPR2AQCAWRNDOZSGRY5II4WS2CZ/
• https://security.gentoo.org/glsa/202208-17Third Party Advisory
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-48rx-3gmf-g74jThird Party Advisory
• https://github.com/nextcloud/server/pull/27329Patch, Third Party Advisory
• https://hackerone.com/reports/1214158Permissions Required
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BVZS26RDME2DYTKET5AECRIZDFUGR2AZ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J63NBVPR2AQCAWRNDOZSGRY5II4WS2CZ/
• https://security.gentoo.org/glsa/202208-17Third Party Advisory

Published

Jul 12, 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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