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Fencer Vulns
high 8.1

CVE-2021-32800 json

Bypass of Two Factor Authentication in Nextcloud server

published 2021-09-07 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-19560

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

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.

Patch / fix

  • nextcloud nextcloud_server 20.0.12, 21.0.4, 22.1.0
  • nextcloud Package Hub 15 SP2 20.0.12-bp152.2.12.1
  • nextcloud Package Hub 15 SP3, openSUSE Leap 15.3 20.0.12-bp153.2.6.1
  • nextcloud openSUSE Leap 15.2 20.0.12-lp152.3.12.1
  • nextcloud Package Hub 12 20.0.12-31.1
  • nextcloud Package Hub 15 SP1 20.0.12-bp151.3.18.1

opensuse advisories openSUSE-SU-2021:1275-1openSUSE-SU-2021:1255-1openSUSE-SU-2021:1253-1openSUSE-SU-2021:1252-1openSUSE-SU-2021:1250-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-32800 updated cvss 8.1

nextcloud: authentication bypass

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.80% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
NVD 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:P/A:N

Affected products

  • nextcloud security-advisories

Classification

Weakness
  • CWE-306 Missing Authentication for Critical Functionality

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.