UpHeron
All vulnerabilities

Servers and applications

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. This could potentially result in an attacker bypassing rate-limit controls such as the Nextcloud brute-force protection.

Severity
Critical 9.8
Published
11 Jun 2021
Last changed
17 Jun 2026
Added to UpHeron
21 Oct 2026
Fixed in
19.0.11, 20.0.10, 21.0.2
Sources
NVD

Affected software

SoftwareAffected versions
NextcloudServers and applications · cpe:a:nextcloud:nextcloud_server
  • Every version before 19.0.11
  • From 20.0.0 before 20.0.10
  • From 21.0.0 before 21.0.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-22915
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-22915