What is the severity of CVE-2021-22915?

CVE-2021-22915 is considered a moderate severity vulnerability due to its potential for allowing brute-force attacks.

How do I fix CVE-2021-22915?

To fix CVE-2021-22915, upgrade to Nextcloud server version 19.0.11, 20.0.10, or 21.0.2 or later.

What types of attacks are associated with CVE-2021-22915?

CVE-2021-22915 is associated with brute force attacks that exploit the lack of IPv6 subnet rate-limiting.

Which versions of Nextcloud are affected by CVE-2021-22915?

CVE-2021-22915 affects Nextcloud server versions prior to 19.0.11, 20.0.10, and 21.0.2.

Is CVE-2021-22915 specific to IPv6 users?

Yes, CVE-2021-22915 specifically impacts users leveraging IPv6 due to inadequate rate limiting in Nextcloud.

Vulnerability/
CVE-2021-22915

critical

9.8

CWE

307

11/6/2021

20/9/2021

CVE-2021-22915

First published: Fri Jun 11 2021(Updated: )

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.

Credit: support@hackerone.com

Affected Software	Affected Version	How to fix
Nextcloud Nextcloud Server	<19.0.11
Nextcloud Nextcloud Server	>=20.0.0<20.0.10
Nextcloud Nextcloud Server	>=21.0.0<21.0.2
Fedoraproject Fedora	=33
Fedoraproject Fedora	=34

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Frequently Asked Questions

What is the severity of CVE-2021-22915?
CVE-2021-22915 is considered a moderate severity vulnerability due to its potential for allowing brute-force attacks.
How do I fix CVE-2021-22915?
To fix CVE-2021-22915, upgrade to Nextcloud server version 19.0.11, 20.0.10, or 21.0.2 or later.
What types of attacks are associated with CVE-2021-22915?
CVE-2021-22915 is associated with brute force attacks that exploit the lack of IPv6 subnet rate-limiting.
Which versions of Nextcloud are affected by CVE-2021-22915?
CVE-2021-22915 affects Nextcloud server versions prior to 19.0.11, 20.0.10, and 21.0.2.
Is CVE-2021-22915 specific to IPv6 users?
Yes, CVE-2021-22915 specifically impacts users leveraging IPv6 due to inadequate rate limiting in Nextcloud.

agent/weakness
agent/severity
agent/references
agent/author
agent/type
agent/event
agent/description
agent/last-modified-date
agent/softwarecombine
agent/first-publish-date
agent/tags
collector/nvd-index
agent/software-canonical-lookup-request
vendor/nextcloud
canonical/nextcloud nextcloud server
version/nextcloud nextcloud server/20.0.0
version/nextcloud nextcloud server/21.0.0
vendor/fedoraproject
canonical/fedoraproject fedora
version/fedoraproject fedora/33
version/fedoraproject fedora/34

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Frequently Asked Questions

What is the severity of CVE-2021-22915?
CVE-2021-22915 is considered a moderate severity vulnerability due to its potential for allowing brute-force attacks.
How do I fix CVE-2021-22915?
To fix CVE-2021-22915, upgrade to Nextcloud server version 19.0.11, 20.0.10, or 21.0.2 or later.
What types of attacks are associated with CVE-2021-22915?
CVE-2021-22915 is associated with brute force attacks that exploit the lack of IPv6 subnet rate-limiting.
Which versions of Nextcloud are affected by CVE-2021-22915?
CVE-2021-22915 affects Nextcloud server versions prior to 19.0.11, 20.0.10, and 21.0.2.
Is CVE-2021-22915 specific to IPv6 users?
Yes, CVE-2021-22915 specifically impacts users leveraging IPv6 due to inadequate rate limiting in Nextcloud.