Security readout for executives and security teams
Plain-English summary
CVE-2021-28811 is a command injection flaw in Roon Server. If exploited, it could let a remote attacker run arbitrary commands. The provided CVSS vector rates impact as high for confidentiality, integrity, and availability, but exploitation requires high privileges. Roon Labs fixed it in Roon Server 2021-05-18 and later.
Executive priority
Treat as a high-priority remediation for any managed Roon Server deployment. The business urgency is strongest where Roon Server is reachable over a network and administrative access could be abused.
Technical view
The issue is classified as CWE-78 command injection in Roon Server. The CVSS 3.1 vector is AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H, indicating network reachability, low attack complexity, no user interaction, high privileges required, unchanged scope, and high impact across CIA.
Likely exposure
Exposure is limited to Roon Server deployments running versions before 2021-05-18. The source bundle does not provide exact vulnerable version ranges, CPEs, or deployment prerequisites beyond Roon Server.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. Risk is still material because successful exploitation could execute arbitrary commands, but the CVSS vector indicates the attacker needs high privileges.
Researcher notes
Key gaps are the unspecified affected version range and absent CPEs. The high-privilege requirement materially affects exploitability assessment. Do not claim active exploitation from the provided evidence.
Mitigation direction
- Upgrade Roon Server to 2021-05-18 or later.
- Review the QNAP advisory for platform-specific update guidance.
- Inventory all Roon Server instances and confirm ownership.
- Restrict access to administrative interfaces while upgrade status is verified.
- Check vendor guidance for any newer replacement advisories.
Validation and detection
- Confirm each Roon Server reports version 2021-05-18 or later.
- Identify any Roon Server installations with unspecified or unknown versions.
- Verify QNAP-managed deployments have received the relevant package update.
- Review available logs for unexplained command or process execution.
- Document exceptions where version evidence cannot be obtained.
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-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-2021-28811 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
- 7.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/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:H/UI:N/S:U/C:H/I:H/A:H1.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.2HighVector: CVSS:3.1/AV:N/AC:L/PR:H/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-21-17CVE 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.