// For flags

CVE-2021-32654

Attacker can obtain write access to any federated share/public link

Severity Score

9.1
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.11, 20.0.10, and 21.0.2, an attacker is able to receive write/read privileges on any Federated File Share. Since public links can be added as federated file share, this can also be exploited on any public link. Users can upgrade to patched versions (19.0.11, 20.0.10 or 21.0.2) or, as a workaround, disable federated file sharing.

Nextcloud Server es un paquete de Nextcloud que maneja el almacenamiento de datos. En versiones anteriores a 19.0.11, 20.0.10 y 21.0.2, un atacante puede recibir privilegios de escritura y lectura en cualquier recurso compartido de archivo federado. Dado que los enlaces públicos pueden ser agregados como archivos compartidos federados, esto también puede ser explotado en cualquier enlace público. Los usuarios pueden actualizar a versiones parcheadas (19.0.11, 20.0.10 o 21.0.2) o, como solución alternativa, deshabilitar el uso compartido de archivos federados

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-05-12 CVE Reserved
  • 2021-06-01 CVE Published
  • 2024-02-15 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-639: Authorization Bypass Through User-Controlled Key
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Nextcloud
Search vendor "Nextcloud"
 Nextcloud Server
Search vendor "Nextcloud" for product "Nextcloud Server"
 < 19.0.11
Search vendor "Nextcloud" for product "Nextcloud Server" and version " < 19.0.11"
-
Affected
Nextcloud
Search vendor "Nextcloud"
 Nextcloud Server
Search vendor "Nextcloud" for product "Nextcloud Server"
 >= 20.0.0 < 20.0.10
Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 20.0.0 < 20.0.10"
-
Affected
Nextcloud
Search vendor "Nextcloud"
 Nextcloud Server
Search vendor "Nextcloud" for product "Nextcloud Server"
 >= 21.0.0 < 21.0.2
Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 21.0.0 < 21.0.2"
-
Affected