CVE-2021-28805

Name: CVE-2021-28805
Creator: NVD / NIST
Published: 2021-06-11T07:15:06.593+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.24%

Last modified Jun 17, 2026

CVE-2021-28805 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. Inclusion of sensitive information in the source code has been reported to affect certain QNAP switches running QSS. If exploited, this vulnerability allows attackers to read application data. EPSS estimates a 0.24% chance of exploitation in the next 30 days.

Description

Inclusion of sensitive information in the source code has been reported to affect certain QNAP switches running QSS. If exploited, this vulnerability allows attackers to read application data. This issue affects: QNAP Systems Inc. QSS versions prior to 1.0.3 build 20210505 on QSW-M2108-2C; versions prior to 1.0.3 build 20210505 on QSW-M2108-2S; versions prior to 1.0.3 build 20210505 on QSW-M2108R-2C; versions prior to 1.0.12 build 20210506 on QSW-M408.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.24%

14.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Qnap	Qss	< 1.0.3
Qnap	Qss	< 1.0.12

References

https://www.qnap.com/zh-tw/security-advisory/qsa-21-24Vendor Advisory
https://www.qnap.com/zh-tw/security-advisory/qsa-21-24Vendor Advisory

Timeline

Published: Jun 11, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-28805?

How severe is CVE-2021-28805?

CVE-2021-28805 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.24% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28805?

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-2021-28805?

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

Scan your code now

Source: NVD / NIST