CVE-2021-22915

Critical

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.

SeverityCritical

CVSS9.8

Exploit probability—

Product

Nextcloud Server

PublishedJun 11, 2021

First seenJun 11, 2021

Weakness typeCWE-307CWE-307

How to fix

Update

nextcloud nextcloud_server19.0.11, 20.0.10, 21.0.2 or later

Vendor advisories

lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6BO6P6MP2MOWA6PZRXX32PLWPXN5O4S/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AGXGR6HYGQ6MZXISMJEHCOXRGRFRUFMA/

Affected products

Product	Affected versions	Fixed in
nextcloud nextcloud_server	v < 19.0.11, 20.0.0 ≤ v < 20.0.10, 21.0.0 ≤ v < 21.0.2	19.0.11, 20.0.10, 21.0.2
fedoraproject fedora	33, 34	—

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