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 Server | <19.0.11 | |
| Nextcloud Server | >=20.0.0<20.0.10 | |
| Nextcloud Server | >=21.0.0<21.0.2 | |
| Red Hat Fedora | =33 | |
| Red Hat Fedora | =34 |
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Reference Links
- https://hackerone.com/reports/1154003
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AGXGR6HYGQ6MZXISMJEHCOXRGRFRUFMA/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L6BO6P6MP2MOWA6PZRXX32PLWPXN5O4S/
- https://nextcloud.com/security/advisory/?id=NC-SA-2021-009
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.
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- version/red hat fedora/34