CVE intelligence and bounded remediation

CVE-2021-28813 — Qnap Qsw-M2116P-2T2S Firmware security vulnerability

Critical CVSS 9.6

A vulnerability involving insecure storage of sensitive information has been reported to affect QSW-M2116P-2T2S and QNAP switches running QuNetSwitch. If exploited, this vulnerability allows remote attackers to read sensitive information by accessing the unrestricted storage mechanism.We have already fixed this vulnerability in the following versions: QSW-M2116P-2T2S 1.0.6 build 210713 and later QGD-1600P: QuNetSwitch 1.0.6.1509 and later QGD-1602P: QuNetSwitch 1.0.6.1509 and later QGD-3014PT: QuNetSwitch 1.0.6.1519 and later

Severity
Critical
CVSS
9.6 (3.1)
Published
2021-09-10
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-259, CWE-522, CWE-798, CWE-922

Affected products

  • qnap / qsw-m2116p-2t2s_firmware
  • qnap / qunetswitch

Matched remediation archetype

Authentication bypass and missing authentication

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Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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