QNAP VioStor NVR OS Command Injection Vulnerability
QNAP · VioStor NVR
An OS command injection flaw in QNAP VioStor NVR, affecting legacy models running QVR Firmware 4.x, lets commands be executed on the device because of improper neutralization of special elements in OS commands. An attacker who has network access and a valid low-privilege user account can exploit it without any user interaction to run commands on the affected system.
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
- Exploited
- Yes, in CISA KEV
- Reports
- 0
- Tactics
- 1/15
How an attack unfolds
Based on MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. mappings. Select a step to see the evidence.Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
First seen exploited 6 days after disclosure.
- Disclosedday 0
- First seen exploitedVulnCheck KEV evidence+6 days
- Added to CISA KEVEU database agrees+13 days
CISA KEV listing is when exploitation was confirmed, not necessarily the first attack.
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
2 TechniqueOne specific attacker behaviour in MITRE ATT&CK, such as T1190 “Exploit Public-Facing Application”. IDs with a dot, like T1059.004, are sub-techniques., grouped by TacticThe attacker’s goal at a stage of an attack in MITRE ATT&CK, such as Initial Access or Persistence. Each technique belongs to one or more tactics. in kill-chain order 2ImpactTA0040
CVE-2023-47565 is an OS command injection vulnerability in QNAP VioStor network video recorder (NVR) devices. This vulnerability has been publicly reported to be leveraged during the InfectedSlurs campaign to install a Mirai malware variant with the intention of creating a distributed denial-of-service (DDoS) botnet with these infected devices.
Lower-confidence links (1)
These come from early or generic mappings, text matching, or contradict this CVE’s details (for example a public-facing technique on a bug that needs a user to open a file). Shown for completeness.
- Exploitation for Client ExecutionT1203 server-side bug exploitable without user interaction; client-execution technique does not fit
Detection
0 rules for this CVE · 16 general rules for its techniquesRules for this CVE
0Sigma ruleAn open, vendor-neutral detection rule for log data. Security teams convert Sigma rules into searches for their own SIEM. that reference CVE-2023-47565 directly.CVE-specific rules are not available in this build. Search SigmaHQ ↗
General rules for this CVE’s techniques
These detect the technique in general, not this specific vulnerability.
Resource HijackingT149613 general rules
- Linux Crypto Mining Pool Connectionshighstable
- Monero Crypto Coin Mining Pool Lookuphighstable
- Network Communication With Crypto Mining Poolhighstable
- Potential Crypto Mining Activityhighstable
- Linux Crypto Mining Indicatorshightest
- Azure Kubernetes Network Policy Changemediumtest
- Azure Kubernetes RoleBinding/ClusterRoleBinding Modified and Deletedmediumtest
- Azure Kubernetes Secret or Config Object Accessmediumtest
Network Denial of ServiceT14983 general rules
Sigma rules © SigmaHQ, Detection Rule License 1.1; linked, not reproduced.
What security researchers reported
Not named in any threat report yetAlso mentioned in 50 community threat pulses (AlienVault OTX)
Weaker evidencePulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.
- Actively_Exploited_Kev | Oct 30, 202629 Oct 2026
- Actively_Exploited_Kev | Oct 29, 202628 Oct 2026
- Actively_Exploited_Kev | Oct 28, 202627 Oct 2026
- Actively_Exploited_Kev | Oct 27, 202626 Oct 2026
- Actively_Exploited_Kev | Oct 24, 202623 Oct 2026
- Actively_Exploited_Kev | Oct 23, 202622 Oct 2026
- 44 more on OTX