Security readout for executives and security teams
Plain-English summary
CVE-2017-7876 is a critical command injection issue in QNAP QTS. A remote attacker could run arbitrary commands in the compromised application. QNAP says the issue was fixed in QTS 4.2.6 build 20170517, QTS 4.3.3.0174 build 20170503, and later versions.
Executive priority
Treat this as urgent for any legacy or exposed QNAP QTS deployment. The business risk is full device compromise, including data theft, tampering, and service disruption, if vulnerable systems remain reachable.
Technical view
The CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H, indicating network reachability, no authentication, no user interaction, and full confidentiality, integrity, and availability impact. Public metadata does not provide affected version ranges, endpoint details, CWE mapping, or exploit mechanics.
Likely exposure
Likely exposure is QNAP systems running QTS versions older than the fixed builds. The source metadata does not list exact affected products or vulnerable version ranges, so exposure should be confirmed against QNAP advisory and release-note guidance.
Exploitation context
No provided source states active exploitation, and the CVE is not listed as CISA KEV in the bundle. The severity comes from remote, unauthenticated command execution potential, not from confirmed exploitation evidence here.
Researcher notes
The evidence supports critical severity and fixed QTS builds, but not precise affected ranges or exploitation status. Avoid assuming all QNAP products are affected; validate QTS version/build and consult QNAP’s advisory for applicability.
Mitigation direction
- Upgrade QTS to a fixed build or later supported version.
- Check QNAP advisory NAS-201707-12 for vendor-specific guidance.
- Prioritize internet-facing or remotely administered QTS systems.
- Limit QTS management exposure while patching is in progress.
- Retire or isolate systems that cannot receive supported QTS updates.
Validation and detection
- Inventory QNAP QTS assets and record exact versions and build numbers.
- Confirm QTS is at least 4.2.6 build 20170517 or 4.3.3.0174 build 20170503.
- Review perimeter exposure for QTS administrative interfaces.
- Check vendor advisories for any model-specific applicability gaps.
- Review logs for suspicious administrative activity where available.
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.
Execution 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-2017-7876 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
- 10 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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:N/UI:N/S:C/C:H/I:H/A:H3.96Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
10CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.qnap.com/en/release-notes/qts/4.3.3.0174/20170503CVE reference · x_refsource_MISC
- https://www.qnap.com/en/release-notes/qts/4.2.6/20170517CVE reference · x_refsource_MISC
- https://www.qnap.com/zh-tw/security-advisory/nas-201707-12CVE 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.