Security readout for executives and security teams
Plain-English summary
Some QNAP switch firmware stored sensitive information in a way attackers could reach without authentication. The business risk is compromise of switch management or network operations, because the CVSS record indicates high integrity and availability impact if the issue is exploited.
Executive priority
Treat this as a priority patching item for affected QNAP switches, especially in production network segments. The issue is critical by CVSS and involves sensitive information exposure, but the provided sources do not show active exploitation.
Technical view
CVE-2021-28813 is insecure storage of sensitive information in QSW-M2116P-2T2S and QNAP QuNetSwitch, mapped to CWE-259, CWE-522, and CWE-798. CVSS 3.1 is 9.6: adjacent vector, low complexity, no privileges, no user interaction, changed scope, and high integrity/availability impact.
Likely exposure
Exposure is limited to the listed QNAP switch products before fixed versions: QSW-M2116P-2T2S before 1.0.6 build 210713; QGD-1600P/QGD-1602P before QuNetSwitch 1.0.6.1509; and QGD-3014PT before QuNetSwitch 1.0.6.1519. The provided sources do not establish internet-wide exposure.
Exploitation context
The QNAP advisory says remote attackers could read sensitive information by accessing an unrestricted storage mechanism. CISA KEV status is false in the bundle, and no provided source states active exploitation. The CVSS vector suggests exploitation is from an adjacent network, not necessarily the open internet.
Researcher notes
The public bundle does not describe exact storage paths, credential types, or reproduction details. Analysis should stay focused on version validation, network adjacency assumptions, and QNAP's fixed builds. Avoid inferring affected products beyond the named switch models and QuNetSwitch versions.
Mitigation direction
- Upgrade QSW-M2116P-2T2S to 1.0.6 build 210713 or later.
- Upgrade QGD-1600P and QGD-1602P QuNetSwitch to 1.0.6.1509 or later.
- Upgrade QGD-3014PT QuNetSwitch to 1.0.6.1519 or later.
- Check QNAP advisory QSA-21-37 for model-specific guidance before maintenance.
- Limit switch management access to trusted administrative networks.
Validation and detection
- Inventory QNAP switches and identify QSW-M2116P-2T2S, QGD-1600P, QGD-1602P, and QGD-3014PT.
- Record installed QuNetSwitch or switch firmware versions for each device.
- Compare versions against the fixed builds named by QNAP.
- Confirm management interfaces are not reachable from untrusted network segments.
- Review logs for unusual management access around affected devices.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-259: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-522: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-798: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-28813 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H2.86Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.6CriticalVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.qnap.com/en/security-advisory/qsa-21-37CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Use of Hard-coded Password
Use of Hard-coded Password represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Insufficiently Protected Credentials
Insufficiently Protected Credentials represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Use of Hard-coded Credentials
Use of Hard-coded Credentials represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.