CASCACascade Atlas

Evidence dossier

CVE-2023-47565

Legacy VioStor NVR

77.1–94.1Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

An 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

State
PUBLISHED
Published
Dec 8, 2023
Updated
Oct 21, 2025
Evidence coverage
85%
CISA KEVCatalog member

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

FIRST EPSS73.28%

2026-07-18 · v2026.06.15 · percentile 99.4%

Source stateNo scored conflict

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

qnaporiginal assertion
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Legacy VioStor NVR

CISA KEVoriginal assertion
observed_exploitation

QNAP VioStor NVR OS Command Injection Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.732770000000; percentile 0.993980000000

Applicability

Cited product scope

Trace impact →
QNAP Systems Inc.VioStor NVR
[{"status": "affected", "version": "4.x", "lessThan": "5.0.0", "versionType": "custom"}]unknown
Unknown vendorUnknown product
cpe:2.3:o:qnap:qvr_firmware:*:*:*:*:*:*:*:*; start including 4.0.0; end excluding 5.0.0supported

Assessments

CVSS by origin

8.8
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.0
security@qnapsecurity.com.twCVSS 3.1 · role SecondaryCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.0
qnapCVSS 3.1 · role unknownCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.