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CVE-2021-37617

23
FAUCET Score

CVE-2021-37617 affects Nextcloud Desktop Client versions 3.0.3 through 3.2.4, where a flaw in the uninstaller script allows for arbitrary code execution. During installation, the client searches for 'Uninstall.exe' in a user-writable directory, enabling a malicious user to place a rogue executable that would run with administrative privileges. This vulnerability carries a CVSS score of 7.3 (HIGH), indicating a local attack vector with low complexity, requiring user interaction, and potentially leading to high impact on confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 3.0.3, < 3.3.0CPE matchmatch criteria
cpe:2.3:a:nextcloud:desktop:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.3HIGH

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.3
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.47%
Probability of exploitation in next 30 days
EPSS Percentile
38.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0047 is in the 70th percentile among its peer group of 759 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / nextcloud/desktop/pull/3497
PatchThird Party Advisory
github.com / nextcloud/security-advisories/security/advisories/GHSA-6q2w-v879-q24v
Third Party Advisory
hackerone.com / reports/1240749
Permissions RequiredThird Party Advisory