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CVE-2021-38688

24
FAUCET Score

CVE-2021-38688 is an improper authentication vulnerability affecting QNAP's Qfile Android application, specifically versions prior to 3.0.0.1105. This high-severity vulnerability (CVSS 7.5) allows unauthenticated remote attackers to compromise the app and access sensitive information, requiring no user interaction. While no public exploits, Metasploit modules, or Nuclei templates are currently available, and there's minimal community discussion, users should update to Qfile 3.0.0.1105 or later to mitigate the risk.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.0.0.1105CPE matchmatch criteria
cpe:2.3:a:qnap:qfile:*:*:*:*:*:android:*:*

CVSS Data

CVSS version used by this source: 3.1

7.1HIGH

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

Attack Vector
ADJACENT_NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.2
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.81%
Probability of exploitation in next 30 days
EPSS Percentile
53.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0081 is in the 28th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

qnap.com / en/security-advisory/qsa-21-55
Vendor Advisory