What it is
CVE-2017-7876 is an unauthenticated vulnerability affecting Qnap QTS. This command injection vulnerability in QTS allows attackers to run arbitrary commands in the compromised application.
Vulnerability report
Trusted Third Party Report
High Confidence
Not in CISA KEV
CVE-2017-7876
QTS Command Injection
Qnap / QTS
- Severity
- CVSS 10.0 · Critical
- Confidence
- High
- Exploit status
- Trusted Third Party Report
- EPSS
- 3.4%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Have exploitation attempts been observed?
Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Also reported by third-party sources. Confidence is high.
Who is affected?
Qnap / QTS.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
This command injection vulnerability in QTS allows attackers to run arbitrary commands in the compromised application
This command injection vulnerability in QTS allows attackers to run arbitrary commands in the compromised application.
QNAP have already fixed the issue in QTS 4.2.6 build 20170517, QTS 4.3.3.0174 build 20170503 and later versions.
- Published
- 15 Jun 2017
- Exploitation Attempts Reported
- 15 Sep 2026
- Attack vector
- Remote
- Complexity
- Low
- Privileges
- None
- User interaction
- None
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2017-7876
- qnap.com/en/release-notes/qts/4.3.3.0174/20170503 qnap.com · CVE Record https://www.qnap.com/en/release-notes/qts/4.3.3.0174/20170503
- qnap.com/en/release-notes/qts/4.2.6/20170517 qnap.com · CVE Record https://www.qnap.com/en/release-notes/qts/4.2.6/20170517
- qnap.com/zh-tw/security-advisory/nas-201707-12 qnap.com · CVE Record https://www.qnap.com/zh-tw/security-advisory/nas-201707-12
Exploitation evidence
Evidence of exploitation attempts
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploitation Attempts Observed in the Wild
The Shadowserver
A trusted third party reported exploitation attempts.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the Previdian Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| The Shadowserver First | 2026-09-15 00:00 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Scanner coverage
No scanner integrations recorded yet.
Virtual patch status
No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Risk and context
Severity, weaknesses, and research context
CVSS v3.1
10.0
Critical
Potential damage if exploited. Separate from whether attackers are using it.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS
3.4%
Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.
All CVSS Scores
CVSS v3.1
10.0
Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS v2.0
7.5
High
AV:N/AC:L/Au:N/C:P/I:P/A:P
Timeline
From disclosure to observed exploitation attempts
-
00:00 UTC
Added to Previdian KEV Feed
High-confidence, third-party report of exploitation attempts
-
20:00 UTC
CVE published
Vulnerability disclosed publicly
-
00:00 UTC
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2017-7876
Sample API response{
"cve_id": "CVE-2017-7876",
"confidence": "High",
"cvss_score": 10.0,
"cvss_estimated": false,
"epss_score": 0.03366,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}