Medium severity · published Mar 8, 2022
CVE-2021-41239
Nextcloud server is a self hosted system designed to provide cloud style services
5.3
CVSS
1.2%
EPSS
No
On KEV
Description
Nextcloud server is a self hosted system designed to provide cloud style services. In affected versions the User Status API did not consider the user enumeration settings by the administrator. This allowed a user to enumerate other users on the instance, even when user listings where disabled. It is recommended that the Nextcloud Server is upgraded to 20.0.14, 21.0.6 or 22.2.1. There are no known workarounds.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.2% · higher than 69% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NS
Nextcloud Server · Nextcloud
before 20.0.14; 21.0.0 before 21.0.6; 22.2.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-41239
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-41239
Issue Tracking
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-g722-cm3h-8wrx
Issue Tracking
https://github.com/nextcloud/server/issues/27122
Patch
https://github.com/nextcloud/server/pull/29260
Third Party Advisory
https://security.gentoo.org/glsa/202208-17
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