CVE-2023-47565
HighExploitedPublic exploitAn OS command injection vulnerability has been found to affect legacy QNAP VioStor NVR models running QVR Firmware 4.x.
Published Dec 11, 2023 · Updated Oct 21, 2025
Key Facts
Patch immediately- CVE-2023-47565 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Qvr Firmware (Qnap), VioStor NVR.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 14, 2023. Public exploit code is available.
- EPSS estimates a 73% probability of exploitation in the next 30 days.
- Fixed versions are available, including Qvr Firmware 5.0.0, VioStor NVR 5.0.0.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
73%
Higher than 99.4% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2023-47565 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Dec 21, 2023 | Jan 11, 2024 | Not reported |
| Industry KEV feed | Dec 14, 2023 | Jan 11, 2024 | Not reported |
| CIRCL KEV | Dec 21, 2023 | Jan 11, 2024 | Not reported |
| ENISA EUVD | Dec 21, 2023 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Qvr FirmwareQnap | See advisory | 5.0.0 |
| VioStor NVR | >= 4.x | 5.0.0 |
Patched Releases
Qvr Firmware
5.0.0
VioStor NVR
5.0.0
Timeline
Publicly disclosed
Dec 11, 2023
Added to Industry KEV feed
Dec 14, 2023
Added to CISA KEV
Dec 21, 2023
Added to CIRCL KEV
Dec 21, 2023
Added to ENISA EUVD
Dec 21, 2023
Last updated
Oct 21, 2025
Weakness Type
- CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
References
- advisoryhttps://www.govcert.gov.hk/en/alerts_detail.php?id=1179
- advisoryhttps://www.qnap.com/en/security-advisory/qsa-23-07
- advisoryhttps://www.qnap.com/en/security-advisory/qsa-23-40
- advisoryhttps://www.qnap.com/en/security-advisory/qsa-23-48
- advisoryUSOM advisory
FAQ
Common Questions.
An OS command injection vulnerability has been found to affect legacy QNAP VioStor NVR models running QVR Firmware 4.x.
Affected: Qvr Firmware (Qnap); VioStor NVR versions >= 4.x. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 14, 2023.
Yes. It was added on Dec 21, 2023 with a federal remediation due date of Jan 11, 2024.
Public exploit code is available.
Fixed versions are available, including Qvr Firmware 5.0.0, VioStor NVR 5.0.0.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2023-47565 Running On Your Attack Surface?
Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.
Request A Demo