CVE-2021-28801: Out-of-Bounds Read Vulnerability in QSS

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-06-11 · updated 2026-06-17
Weakness: CWE-125

Description

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 Systems Inc. QSS: before 1.0.2 — fixed in 1.0.2

How to fix

Upgrade to a fixed version: QNAP Systems Inc. QSS 1.0.2. Check the vendor advisory for mitigations.

References

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