2.7

CVE-2025-66549: nextcloud desktop

CVSS: 2.7v3.1LowAnalyzed
AliasesUBUNTU-CVE-2025-66549DEBIAN-CVE-2025-66549
Published 05-12-2025Last modified 08-12-2025
Open JSON

Vulnerability summary

CVE-2025-66549 is a low (CVSS 2.7) vulnerability in nextcloud desktop. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 21% of scored vulnerabilities.

Overall risk
11/100
0100
Low · default modelHow is this calculated?
CVSS score
2.7/10
010
Low · v3.1 (NVD)
EPSS score
0.30%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 05-12-2025
    PublishedVulnerability first disclosed.
  2. 08-12-2025
    Last modifiedVulnerability information updated.

Description

Nextcloud Desktop is the desktop sync client for Nextcloud. Prior to 3.16.5, when trying to manually lock a file inside an end-to-end encrypted directory, the path of the file was sent to the server unencrypted, making it possible for administrators to see it in log files. This vulnerability is fixed in 3.16.5.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.30%

Chance of exploitation in the next 30 days

Percentile

21%

Versus all other CVEs

30-day change

0.00 pp

From 0.30% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.30%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Nextcloud2 products
Debian1 product
  • nextcloud-desktopAll versions (No fix recorded) | < 3.16.6-3
Ubuntu1 product
  • nextcloud-desktopAll versions (No fix recorded)

3 vendors · 4 products

References

7 links