Medium severity · published Mar 3, 2021
CVE-2021-22877
A missing user check in Nextcloud prior to 20.0.6 inadvertently populates a user's own credentials for other users external storage configuration when not already configured yet
6.5
CVSS
1.7%
EPSS
No
On KEV
Description
A missing user check in Nextcloud prior to 20.0.6 inadvertently populates a user's own credentials for other users external storage configuration when not already configured yet.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.7% · higher than 77% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FE
Fedora · Fedoraproject
34 · source: NVD
NS
Nextcloud Server · Nextcloud
before 20.0.6 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-22877
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-22877
Exploit
https://github.com/nextcloud/server/issues/24600
Patch
https://github.com/nextcloud/server/pull/25224
Issue Tracking
https://hackerone.com/reports/1061591
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6BO6P6MP2MOWA6PZRXX32PLWPXN5O4S/
Broken Link
https://nextcloud.com/security/advisory/?id=NC-SA-2021-004
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