CVE-2021-32654

Name: CVE-2021-32654
Creator: NVD / NIST
Published: 2021-06-01T21:15:07.68+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 1.85%

Last modified Jun 17, 2026

CVE-2021-32654 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.11, 20.0.10, and 21.0.2, an attacker is able to receive write/read privileges on any Federated File Share. EPSS estimates a 1.85% chance of exploitation in the next 30 days.

Description

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.11, 20.0.10, and 21.0.2, an attacker is able to receive write/read privileges on any Federated File Share. Since public links can be added as federated file share, this can also be exploited on any public link. Users can upgrade to patched versions (19.0.11, 20.0.10 or 21.0.2) or, as a workaround, disable federated file sharing.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

1.85%

76.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-639

Affected Software

Vendor	Product	Versions
Nextcloud	Nextcloud Server	< 19.0.11
Nextcloud	Nextcloud Server	>= 20.0.0, < 20.0.10
Nextcloud	Nextcloud Server	>= 21.0.0, < 21.0.2

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jf9h-v24c-22g5Third Party Advisory
https://hackerone.com/reports/1170024Permissions Required, Third Party Advisory
https://security.gentoo.org/glsa/202208-17Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jf9h-v24c-22g5Third Party Advisory
https://hackerone.com/reports/1170024Permissions Required, Third Party Advisory
https://security.gentoo.org/glsa/202208-17Third Party Advisory

Timeline

Published: Jun 1, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-32654?

How severe is CVE-2021-32654?

CVE-2021-32654 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 1.85% probability of exploitation in the next 30 days.

How do I fix CVE-2021-32654?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-32654?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST