CVE-2021-22877
A missing user check in Nextcloud prior to 20.0.6 inadvertently populates a user's own...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-22877- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N - CVSS 2.0
- 5.5 Medium
AV:N/AC:L/Au:S/C:P/I:P/A:N - Weakness
- CWE-284, CWE-862
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2021-22877- Weakness
- CWE-284
- Updated
- 2026-11-02
EUVDEUVD-2021-10012 No score
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.
- Record
EUVD-2021-10012- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-v65r-wc6r-r9x8
A missing user check in Nextcloud prior to 20.0.6 inadvertently populates a user's own...
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.
- Record
GHSA-v65r-wc6r-r9x8- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-269, CWE-862
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2021-22877- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, products | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-22877 is a medium vulnerability (CVSS 6.5) in Fedoraproject Fedora, published March 3, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.69%, the 77th percentile. No source names a fixed version.
References
hackerone.com/reports/1061591
nextcloud.com/security/advisory?id=NC-SA-2021-004
github.com/nextcloud/server/issues/24600
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6BO6P6MP2MOWA6PZRXX32PLWPXN5O4S
nvd.nist.gov/vuln/detail/CVE-2021-22877