Answer in brief
CVE-2023-47565 records a High severity vulnerability in Legacy VioStor NVR. The current sources mark it as known exploited. The current feed maps QNAP Systems Inc./VioStor NVR (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps QNAP Systems Inc./VioStor NVR (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| QNAP Systems Inc./VioStor NVRgeneric | >=4.x <5.0.0 | 5.0.0 |
Published upstream
Dec 8, 2023
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2025
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
May 24, 2026
Added to CISA KEV
Dec 21, 2023
Evidence: source:kev:kev:kev:recordAn OS command injection vulnerability has been found to affect legacy QNAP VioStor NVR models running QVR Firmware 4.x. If exploited, the vulnerability could allow authenticated users to execute commands via a network. We have already fixed the vulnerability in the following versions: QVR Firmware 5.0.0 and later
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2023-47565 records a High severity vulnerability in Legacy VioStor NVR. The current sources mark it as known exploited. The current feed maps QNAP Systems Inc./VioStor NVR (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps QNAP Systems Inc./VioStor NVR (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| QNAP Systems Inc./VioStor NVRgeneric | >=4.x <5.0.0 | 5.0.0 |
Published upstream
Dec 8, 2023
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2025
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
May 24, 2026
Added to CISA KEV
Dec 21, 2023
Evidence: source:kev:kev:kev:recordAn OS command injection vulnerability has been found to affect legacy QNAP VioStor NVR models running QVR Firmware 4.x. If exploited, the vulnerability could allow authenticated users to execute commands via a network. We have already fixed the vulnerability in the following versions: QVR Firmware 5.0.0 and later
Quoted source text, attributed separately from HOL analysis.