Auth bypass in Nextcloud Server
CVE-2021-32800
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.018 (78.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 78.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000
Affected products
- Nextcloud Server
- Nextcloud Security-Advisories — versions < 20.0.12, >= 21.0.0, < 21.0.4, >= 22.0.0, < 22.1.0
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-gv5w-8q25-785v (Third Party Advisory)
- github.com/nextcloud/server/pull/28078 (Patch, Third Party Advisory)
- hackerone.com/reports/1271052 (Permissions Required, Third Party Advisory)
- security.gentoo.org/glsa/202208-17 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-32800?
- CVE-2021-32800 is a high-severity vulnerability in Nextcloud Server, classified under Missing Authentication for Critical Function. CVSS score: 8.1/10. Published 2021-09-07.
- How severe is CVE-2021-32800?
- High severity. CVSS v3 base score is 8.1 out of 10.