Low severity · published Jun 1, 2021
CVE-2021-32655
Nextcloud Server is a Nextcloud package that handles data storage
3.5
CVSS
1%
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 convert a Files Drop link to a federated share. This causes an issue on the UI side of the sharing user. When the sharing user opens the sharing panel and tries to remove the "Create" privileges of this unexpected share, Nextcloud server would silently grant the share read privileges. The vulnerability is patched in versions 19.0.11, 20.0.10 and 21.0.2. No workarounds are known to exist.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 64% 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-2021-32655
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-32655
Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-grph-cm44-p3jv
Permissions Required
https://hackerone.com/reports/1167929
Third Party Advisory
https://security.gentoo.org/glsa/202208-17
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