CVE-2021-37617

Name: CVE-2021-37617
Creator: NVD / NIST
Published: 2021-08-18T18:15:08.063+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.3/10EPSS 0.47%

Last modified Jun 17, 2026

CVE-2021-37617 is a high-severity vulnerability rated 7.3/10 on the CVSS scale. The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with a computer. The Nextcloud Desktop Client invokes its uninstaller script when being installed to make sure there are no remnants of previous installations. EPSS estimates a 0.47% chance of exploitation in the next 30 days.

Description

The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with a computer. The Nextcloud Desktop Client invokes its uninstaller script when being installed to make sure there are no remnants of previous installations. In versions 3.0.3 through 3.2.4, the Client searches the `Uninstall.exe` file in a folder that can be written by regular users. This could lead to a case where a malicious user creates a malicious `Uninstall.exe`, which would be executed with administrative privileges on the Nextcloud Desktop Client installation. This issue is fixed in Nextcloud Desktop Client version 3.3.0. As a workaround, do not allow untrusted users to create content in the `C:\` system folder and verify that there is no malicious `C:\Uninstall.exe` file on the system.

Metrics

CVSS 3.1

7.3/10

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

EPSS Probability

0.47%

37.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nextcloud	Desktop	>= 3.0.3, < 3.3.0

References

https://github.com/nextcloud/desktop/pull/3497Patch, Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6q2w-v879-q24vThird Party Advisory
https://hackerone.com/reports/1240749Permissions Required, Third Party Advisory
https://github.com/nextcloud/desktop/pull/3497Patch, Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6q2w-v879-q24vThird Party Advisory
https://hackerone.com/reports/1240749Permissions Required, Third Party Advisory

Timeline

Published: Aug 18, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-37617?

How severe is CVE-2021-37617?

CVE-2021-37617 has a CVSS score of 7.3/10 (HIGH severity). The EPSS model estimates a 0.47% probability of exploitation in the next 30 days.

How do I fix CVE-2021-37617?

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-2021-37617?

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

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Source: NVD / NIST