Security readout for executives and security teams
Plain-English summary
CVE-2021-28812 is a high-severity command injection flaw in QNAP Video Station. On affected QNAP platforms, a remote attacker with low privileges could run arbitrary commands, creating serious risk to stored data and device availability.
Executive priority
Treat this as a near-term remediation item for any QNAP systems storing sensitive data or reachable by non-administrative users. Prioritize internet-exposed or business-critical devices first.
Technical view
The vulnerability is classified as command injection under CWE-77/CWE-78, with CVSS 3.1 score 8.8. Affected versions are Video Station before 5.5.4 on QTS 4.5.2, QuTS hero h4.5.2, and QuTScloud c4.5.4.
Likely exposure
Organizations are exposed if they run QNAP Video Station before 5.5.4 on the listed QTS, QuTS hero, or QuTScloud releases. Risk is higher where the service is reachable by untrusted users or the internet.
Exploitation context
The source bundle says remote attackers can execute arbitrary commands and the CVSS vector requires low privileges. It does not provide evidence of active exploitation, and the CVE is not marked KEV.
Researcher notes
The CVSS vector is AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Sources do not identify a vulnerable endpoint, exploit method, or indicators of compromise, so validation should remain version and exposure focused.
Mitigation direction
- Upgrade Video Station to 5.5.4 or later on affected QNAP platforms.
- Review QNAP advisory QSA-21-21 for current vendor instructions.
- Limit Video Station access to trusted networks and users.
- Disable Video Station where it is not business-required.
- Review device logs for unexpected administrative or command-execution activity.
Validation and detection
- Inventory QNAP systems and confirm whether Video Station is installed.
- Check Video Station version against the 5.5.4 fixed-version boundary.
- Confirm whether the host runs QTS 4.5.2, QuTS hero h4.5.2, or QuTScloud c4.5.4.
- Verify QTS 4.3.6 and QTS 4.3.3 deployments are excluded by the advisory.
- Document any internet-exposed Video Station instances for priority remediation.
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-1286: 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-77: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. 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-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-28812 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
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.qnap.com/zh-tw/security-advisory/qsa-21-21CVE 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.