CVE-2021-41177CWE-799

Rate-limits not working on instances without configured memory cache backend

High · published October 25, 2021

CVSS v3.1
8.1
EPSS
2%
Percentile
74.9
In the wild
Unconfirmed
What it is

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`.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.01550 · 74.9th percentile
Weakness
CWE-799 · Improper Control of Interaction Frequency
Published
2021-10-25T21:50Z
EPSS history
Timeline
  • 25 OCT 21:50Z
    Rate-limits not working on instances without configured memory cache backend
    cvelistv5