CVE-2021-32800 Bypass of Two Factor Authentication in Nextcloud server
Attackers can bypass Two Factor Authentication in Nextcloud server using only a password or WebAuthN device, leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-32800?
CVE-2021-32800 is a high-severity authentication bypass vulnerability in Nextcloud Nextcloud Server, published on 7 Sep 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Nextcloud server is an open source, self hosted personal cloud. In affected versions an attacker is able to bypass Two Factor Authentication in Nextcloud. Thus knowledge of a password, or access to a WebAuthN trusted device of a user was sufficient to gain access to an account. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.1.0. There are no workaround for this vulnerability.
Weakness: CWE-306
Which versions are affected by CVE-2021-32800?
It affects 1 product.
Products include Nextcloud Nextcloud Server.
How do I fix CVE-2021-32800?
Upgrade to a fixed version.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2021-32800 being exploited?
There is no known exploitation of CVE-2021-32800 in the wild and no public exploit code.
Other vulnerabilities in Nextcloud Nextcloud Server
- CVE-2021-32802 Preview generation used third-party library not suited for user-generated content in Nextcloud server
- CVE-2023-26482 Scope of workflow operations is not validated in nextcloud server
- CVE-2018-3775 Auth bypass in Nextcloud Server
- CVE-2023-35172 Nextcloud Server password reset endpoint is not brute force protected
- CVE-2023-32320 Nextcloud Server's brute force protection allows someone to send more requests than intended
Sources
Also known as GHSA-gv5w-8q25-785v.