Critical severity · published Jun 1, 2021
CVE-2021-32654
Nextcloud Server is a Nextcloud package that handles data storage
9.1
CVSS
1.8%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.8% · higher than 79% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NS
Nextcloud Server · Nextcloud
before 19.0.11; 20.0.0 before 20.0.10; 21.0.0 before 21.0.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-32654
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-32654
Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jf9h-v24c-22g5
Permissions Required
https://hackerone.com/reports/1170024
Third Party Advisory
https://security.gentoo.org/glsa/202208-17
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