CVE-2023-47565

Legacy VioStor NVR

  • High 8.0
  • Exploited: added to CISA KEV 21 Dec 2023

Description

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

Key facts

Published
8 Dec 2023
Last changed
21 Oct 2025
Assigned by
qnap
KEV added
21 Dec 2023
KEV fix due
11 Jan 2024
EPSS
73.277% likely to be exploited in the next 30 days, higher than 99.468% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: no; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 8.0CVSS 3.1, Highfrom the CNA (qnap)CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

What to do

  • We have already fixed the vulnerability in the following versions: QVR Firmware 5.0.0 and laterCNA solution statement
  • Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

CAPEC-88 OS Command Injection (CNA impact statement)

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
QNAP Systems Inc.VioStor NVR
  • Default status: unaffected
  • 4.x up to but excluding 5.0.0 (affected)

Timeline

  1. 8 Dec 2023 Published
  2. 21 Dec 2023 CVE-2023-47565 added to CISA KEV
  3. 21 Dec 2023 Added to the CISA KEV catalogue

Weakness

Practice this bug class

HackZoneLabs has a hands-on lab on OS command injection (CWE-78).

References