CVE-2023-47565: QNAP VioStor NVR

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

Yes, if you run QNAP VioStor NVR. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2023-12-21, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-01-11; treat that as the outer limit, not the target.
EPSS 73.3%, percentile 99: FIRST’s model estimates a 73.3% chance of exploitation activity in the next 30 days, higher than 99% of all scored CVEs (very high). EPSS is a probability, not a verdict.
Needs an account (low (any account)). Exposure depends on who can log in.

What it is

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

CISA’s summary

QNAP VioStar NVR contains an OS command injection vulnerability that allows authenticated users to execute commands via a network.

Weakness type: CWE-78.

Product: QNAP VioStor NVR · Assigned by: qnap · Published: 2023-12-08

Affected and fixed versions

Vendor	Product	Affected versions (per CVE record)
QNAP Systems Inc.	VioStor NVR	4.x < 5.0.0

Severity scores

Scored by	CVSS	Score	Vector
qnap	3.1	8 High	`CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`

Attack vector: adjacent network only
Attack complexity: low
Privileges required: low (any account)
User interaction: none
Scope: unchanged

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

CISA KEV: added 2023-12-21; federal due date 2024-01-11. Known ransomware use: Unknown.
CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA SSVC assessment: exploitation active, automatable no, technical impact total.
FIRST EPSS (model of 2026-10-21): 73.28% probability of exploitation activity in the next 30 days; percentile 99.

Timeline

2023-12-08 — CVE record published by qnap
2023-12-21 — Added to CISA’s Known Exploited Vulnerabilities catalog
2024-01-11 — CISA remediation deadline for US federal agencies
2025-10-21 — CVE record last updated

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.