Critical severity · published Jun 11, 2021
CVE-2021-22915
Nextcloud server before 19.0.11, 20.0.10, 21.0.2 is vulnerable to brute force attacks due to lack of inclusion of IPv6 subnets in rate-limiting considerations
9.8
CVSS
1.7%
EPSS
No
On KEV
Description
Nextcloud server before 19.0.11, 20.0.10, 21.0.2 is vulnerable to brute force attacks due to lack of inclusion of IPv6 subnets in rate-limiting considerations. This could potentially result in an attacker bypassing rate-limit controls such as the Nextcloud brute-force protection.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.7% · higher than 78% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FE
Fedora · Fedoraproject
33; 34 · source: NVD
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-2021-22915
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-22915
Permissions Required
https://hackerone.com/reports/1154003
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AGXGR6HYGQ6MZXISMJEHCOXRGRFRUFMA/
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-2021-009
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