title: Rate limiter not working reliable when Memcached is installed in Nextcloud
description: Nextcloud is an open source home cloud server. When Memcached is used as `memcache.distributed` the rate limiting in Nextcloud Server could be reset unexpectedly resetting the rate count earlier than intended. Users are advised to upgrade to versions 25.0.11, 26.0.6 or 27.1.0. Users unable to upgrade should change their config setting `memcache.distributed` to `\OC\Memcache\Redis` and install Redis instead of Memcached.
problem types: CWE-307: Improper Restriction of Excessive Authentication Attempts
affected:
{
vendor: nextcloud
product: security-advisories
versions:
version: >= 25.0.0, < 25.0.11, status: affected
version: >= 26.0.0, < 26.0.6, status: affected
version: >= 27.0.0, < 27.1.0, status: affected
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: LOW
baseScore: 4.3
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
version: 3.1
]