High severity · published Oct 25, 2021
CVE-2021-41177
Nextcloud is an open-source, self-hosted productivity platform
8.1
CVSS
1.6%
EPSS
No
On KEV
Description
Nextcloud is an open-source, self-hosted productivity platform. Prior to versions 20.0.13, 21.0.5, and 22.2.0, Nextcloud Server did not implement a database backend for rate-limiting purposes. Any component of Nextcloud using rate-limits (as as `AnonRateThrottle` or `UserRateThrottle`) was thus not rate limited on instances not having a memory cache backend configured. In the case of a default installation, this would notably include the rate-limits on the two factor codes. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5, or 22.2.0. As a workaround, enable a memory cache backend in `config.php`.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.6% · higher than 75% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NS
Nextcloud Server · Nextcloud
before 20.0.13; 21.0.0 before 21.0.5; 22.0.0 before 22.2.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-41177
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-41177
Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fj39-4qx4-m3f2
Patch
https://github.com/nextcloud/server/pull/28728
Permissions Required
https://hackerone.com/reports/1265709
Third Party Advisory
https://security.gentoo.org/glsa/202208-17
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