Vulnerability · Published Sep 7, 2021 · Assigned by GitHub_M

CVE-2021-32800Bypass of Two Factor Authentication in Nextcloud server

High 8.1

In plain English

A high-severity missing authentication in security-advisories from nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.8% (higher than 79% of all known vulnerabilities).

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)1.8%top 21.4% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
nextcloud	security-advisories	< 20.0.12>= 21.0.0, < 21.0.4>= 22.0.0, < 22.1.0

Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-gv5w-8q25-785v x_refsource_CONFIRM
https://github.com/nextcloud/server/pull/28078 x_refsource_MISC
https://hackerone.com/reports/1271052 x_refsource_MISC
GLSA-202208-17 vendor-advisory, x_refsource_GENTOO