CVE-2021-28801: QNAP Qss

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

An out-of-bounds read vulnerability has been reported to affect certain QNAP switches running QSS. If exploited, this vulnerability allows attackers to read sensitive information on the system. This issue affects: QNAP Systems Inc. QSS versions prior to 1.0.2 build 20210122 on QSW-M2108-2C; versions prior to 1.0.2 build 20210122 on QSW-M2108-2S; versions prior to 1.0.2 build 20210122 on QSW-M2108R-2C.

Affected products

• QNAP Qss: before 1.0.2 (fixed in 1.0.2)

Published 2021-06-11. Last modified 2026-06-17.