CVE-2019-11001

What are Reolink IP Cameras?

Reolink manufactures consumer and small-business network (IP) cameras widely sold for home and business security, offering web and cloud-connected management interfaces including email-alert configuration. IP cameras like these are frequently internet-facing (directly or via port-forwarding/UPnP) and, once compromised, are prized by botnet operators for building distributed denial-of-service networks or as persistent footholds inside otherwise well-defended networks — a pattern popularized since the original Mirai botnet's rise to prominence targeting exactly this class of device.

Overview

CVE-2019-11001 is a High-severity OS command injection vulnerability (CWE-78) affecting several Reolink IP camera models, including the RLC-410W, C1 Pro, C2 Pro, RLC-422W, and RLC-511W. An authenticated administrator-level user can abuse the camera's "TestEmail" functionality — intended to let a user verify email-alert settings by sending a test message — to inject and execute arbitrary OS commands with root privileges on the device. Because affected models are now end-of-life, CISA's required action notes that users should discontinue use of the product if no mitigation is available, rather than expecting a vendor patch.

Technical Details

The vulnerability arises because the TestEmail feature passes user-supplied configuration values (such as SMTP server details) into a system command without adequate sanitization, allowing an authenticated admin user to embed shell metacharacters that get executed by the underlying operating system as root. Exploitation requires high privileges (an authenticated admin session) but no user interaction, and once triggered grants full confidentiality, integrity, and availability impact — complete control of the device's embedded Linux operating system.

Discovery

No specific external researcher has been broadly credited for the original public report of this vulnerability.

Exploitation Context

CISA's KEV catalog confirms this vulnerability has been exploited in the wild, despite requiring admin-level authentication — consistent with the reality that many consumer and small-business IP cameras ship with weak, default, or previously breached admin credentials, making the authentication requirement a low bar in practice. Compromised IP cameras of this kind have historically been recruited into botnets used for DDoS attacks and as pivot points for further network intrusion.

Remediation

1. Check whether your specific Reolink model and firmware version is listed as end-of-life at Reolink's product EoL page; if so, plan to replace the device, since no further security fixes should be expected.
2. If firmware updates are still available for your model via Reolink's download center, apply the latest available firmware.
3. Change default admin credentials immediately and use a strong, unique password for camera administration.
4. Never expose camera admin interfaces directly to the internet; place them behind a VPN or firewall-restricted network segment.
5. Monitor network traffic from IP cameras for unexpected outbound connections, a common indicator of botnet recruitment or command-and-control activity.