8.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
5.5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:N/A:P
0.002 Low
EPSS
Percentile
58.2%
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 is upgraded to 20.0.13, 21.0.5 or 22.2.0.
Enable a memory cache backend in config.php
, such as shown in our config.sample.php
.
If you have any questions or comments about this advisory:
8.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
5.5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:N/A:P
0.002 Low
EPSS
Percentile
58.2%