CVE-2023-47565
CVE-2023-47565 is a security flaw in QNAP VioStor NVR, a network drive for storing files and backups at home or in a small office. Someone who already has a way in can use QNAP VioStor NVR to run their own code. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 21 Dec 2023.[1]
QNAP VioStor NVR is in things households have: network drives for files and backups, so the fix matters at home as much as at work. Fixed in version 5.0.0 of VioStor NVR.
Description
CISA calls it an OS command injection in QNAP VioStor NVR. In its words: “QNAP VioStar NVR contains an OS command injection vulnerability that allows authenticated users to execute commands via a network.”[1]
The CVE record adds: “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”[2]
The underlying weakness is OS command injection (CWE-78), in MITRE’s list of common software weaknesses.
It scores 8.8 out of 10 on the Common Vulnerability Scoring System, which rates it high, scored by NVD using CVSS 3.1.[2]
Affected versions
NVD’s record lists one fixed version: everything before it is affected.[2]
| Product | Fixed in |
|---|---|
| VioStor NVR | 5.0.0 |
Every device with QNAP VioStor NVR needs the update.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 21 Dec 2023, 13 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 11 Jan 2024 to fix it.[1]
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 73%. That’s in the top 1% of the flaws it scores.[4]
CISA assesses it as not automatable: each attack takes some work.
CISA doesn’t say who was attacked, or how.
Fix
QNAP has published a fix or advice.[3] CISA’s required action: “Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.”[1]
- Update QNAP VioStor NVR now.Install the latest update from QNAP on every device that has it, and restart when asked. Then turn on automatic updates, so the next fix arrives on its own.
- Check you’re on 5.0.0 or later.Fixed in version 5.0.0 of VioStor NVR. Anything older is what attackers are going after.
- If the maker has stopped updating it, replace it.Network drives stop getting fixes after a few years, and attackers keep a list of the ones that did. If there’s no newer firmware, it won’t be fixed.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 8.8.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks.[1] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at 73%.[4] |
See also
Other QNAP flaws
- CVE-2022-27593, QNAP Photo Station: externally controlled reference ·
- CVE-2019-7195, QNAP Photo Station: path traversal ·
- CVE-2019-7194, QNAP Photo Station: path traversal ·
- CVE-2019-7193, QNAP QTS: improper input validation ·
- CVE-2019-7192, QNAP Photo Station: improper access control ·
Other OS command injection flaws
- CVE-2026-110447, Collabora Online – Built-in CODE Server: online – built-in CODE server OS command injection ·
- CVE-2026-106931, EG Secure Solutions SiteGuard Server Edition: OS command injection ·
- CVE-2026-83549, SonicWall SMA1000 Appliances: OS command injection ·
- CVE-2026-49869, Kestra OSS: OSS OS command injection ·
- CVE-2026-73570, Synacor Zimbra Collaboration Suite (ZCS): OS command injection ·
Added the same day
- CVE-2023-49897, FXC AE1021, AE1021PE: OS command injection ·
Every QNAP flaw on CISA’s list · Everything added in December 2023
References
- ^ Cybersecurity and Infrastructure Security Agency. “QNAP VioStor NVR OS Command Injection Vulnerability”. Known Exploited Vulnerabilities Catalog, added 21 Dec 2023.
- ^ National Institute of Standards and Technology. “CVE-2023-47565 Detail”. National Vulnerability Database, published 8 Dec 2023.
- ^ QNAP. Advisories and fixes: qnap.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.733, percentile 99.5, 31 Oct 2026.
- CVE Program. “CVE-2023-47565”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.