What is CVE-2021-38688?

CVE-2021-38688 is a high-severity vulnerability in QNAP Qfile, classified under Improper Authentication. CVSS score: 7.1/10. Published 2021-12-29.

How severe is CVE-2021-38688?

High severity. CVSS v3 base score is 7.1 out of 10.

Auth bypass in QNAP Qfile

CVE-2021-38688

An improper authentication vulnerability has been reported to affect Android App Qfile. If exploited, this vulnerability allows attackers to compromise app and access information We have already fixed this vulnerability in the following versions of Qfile: Qfile 3.0.0.1105 and later

Vulnerability class: Broken Authentication

Published 2021-12-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (55.4th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

QNAP Qfile
QNAP Systems Inc. Qfile — versions unspecified

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

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

Frequently asked questions

What is CVE-2021-38688?: CVE-2021-38688 is a high-severity vulnerability in QNAP Qfile, classified under Improper Authentication. CVSS score: 7.1/10. Published 2021-12-29.
How severe is CVE-2021-38688?: High severity. CVSS v3 base score is 7.1 out of 10.