CVE-2021-41177

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

25/10/2021

Last modified:

26/10/2022

Description

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`.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 8.10 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): None
Availability (A): High

Base Score 3.x

8.10

Severity 3.x

HIGH

Vector 2.0

AV:N/AC:L/Au:S/C:P/I:N/A:P CVSS v2.0 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: AV:N/AC:L/Au:S/C:P/I:N/A:P

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): Single
Confidentiality (C): Physical
Integrity (I): None
Availability (A): Physical

Base Score 2.0

5.50

Severity 2.0

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:nextcloud:nextcloud_server::::::::		20.0.13 (excluding)
cpe:2.3:a:nextcloud:nextcloud_server::::::::	21.0.0 (including)	21.0.5 (excluding)
cpe:2.3:a:nextcloud:nextcloud_server::::::::	22.0.0 (including)	22.2.0 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2021-41177

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools