CVE-2021-22915 is a critical vulnerability affecting Nextcloud server versions prior to 19.0.11, 20.0.10, and 21.0.2, where rate-limiting mechanisms fail to properly account for IPv6 subnets. This oversight allows attackers to bypass brute-force protection, potentially leading to unauthorized access. With a CVSS score of 9.8 (CRITICAL), this vulnerability is easily exploitable over the network with low complexity, enabling full compromise of confidentiality, integrity, and availability. Despite its severity, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 19.0.11CPE matchmatch criteria | cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* | ||
>= 20.0.0, < 20.0.10CPE matchmatch criteria | cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* | ||
>= 21.0.0, < 21.0.2CPE matchmatch criteria | cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* | ||
33CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* | ||
34CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.