CVE Alert: CVE-2022-40799 – n/a – n/a

Risk verdict

Critical: the vulnerability is actively exploited and documented as a known exploited vulnerability; treat as priority 1.

Why this matters

Authenticated, low-privilege access over the network enables OS-level command execution, with full impact on confidentiality, integrity and availability. In SMB environments, an NVR breach can disrupt surveillance and potentially serve as a foothold to pivot toward other network assets.

Most likely attack path

Exploitation requires network access and authenticated credentials with low privileges; no user interaction is needed. Given the network vector and total impact, an attacker could execute commands directly on the device, gaining persistent control and potentially abusing the backup/config pathway to alter data integrity.

Who is most exposed

Commonly deployed in small to mid-sized businesses where NVRs sit on flat or lightly segmented networks with remote management enabled; weak authentication or misconfiguration increases exposure.

Detection ideas

• Unusual OS-level command executions originating from the backup/config interface.
• Changes to backup configuration or data integrity checks outside normal admin activity.
• Privileged actions or shell access sequences from management interfaces.
• Anomalous outbound traffic or C2-like destinations from the device.
• Authentication attempts or successful logins from unfamiliar IPs or at atypical times.

Mitigation and prioritisation

• Apply the vendor patch or firmware update; treat as priority 1.
• If patching is not immediately possible: restrict network exposure (VPN-only access), disable remote management, and implement strict firewall rules isolating the NVR.
• Enforce strong authentication and rotate credentials; consider MFA where available.
• Segment the NVR from critical assets; monitor for anomalous management activity.
• Plan and test patch deployment in a maintenance window; document changes and enable enhanced logging for post-geo-temporal correlation.