CVE-2021-22915 Security feature bypass in Nextcloud Server
Attackers can bypass brute-force protection by exploiting IPv6 subnet handling, allowing unlimited login attempts against Nextcloud servers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-22915?
CVE-2021-22915 is a critical vulnerability in Fedoraproject Fedora, published on 11 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-307
Which versions are affected by CVE-2021-22915?
It affects 2 products.
Products include Fedoraproject Fedora, Nextcloud Nextcloud Server.
How do I fix CVE-2021-22915?
No fix has been published for CVE-2021-22915 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-22915 being exploited?
There is no known exploitation of CVE-2021-22915 in the wild and no public exploit code.