Reolink IP Camera TestEmail Remote Code Execution Vulnerability Analysis and Mitigation Guide (CVE-2019-11001)
Executive & SecOps Summary
SECOPS ASSESSMENTReolink RLC-410W, C1 Pro, C2 Pro, RLC-422W, and RLC-511W devices running firmware versions up to and including 1.0.227.
An authenticated administrator can inject and execute arbitrary OS commands with root privileges via shell metacharacters in the 'addr1' field of the 'TestEmail' functionality.
Immediately upgrade to the latest official firmware provided by the manufacturer and restrict network access to the camera's management interface.
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Download the latest secure firmware version corresponding to your device model from the official Reolink support website and apply the update via the device management console.
2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, isolate the camera devices within a dedicated VLAN and restrict access to the HTTP/HTTPS management ports using firewall access control lists (ACLs).
# Example: Restrict access to the camera's web interface (ports 80, 443) to a trusted management subnet only
iptables -A INPUT -p tcp -s 10.0.10.0/24 --dport 80 -j ACCEPT
iptables -A INPUT -p tcp -s 10.0.10.0/24 --dport 443 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP3. Log Audit & IoC Verification Commands
Audit web server access logs or network traffic captures to identify suspicious requests targeting the 'TestEmail' endpoint containing shell metacharacters.
# Search web server access logs for TestEmail requests containing potential shell injection payloads
grep -i 'TestEmail' /var/log/lighttpd/access.log | grep -E '(%3B|%26|%60|;|\&|\`)'Block Kernel Privilege Escalation & Ransomware Payloads Before You Can Reboot
Protect unpatched Windows, Linux, and macOS workloads against in-memory exploitation and lateral movement with autonomous EDR.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2019-11001) is an OS command injection vulnerability (CWE-78) residing in the web management interface of several Reolink IP camera models. The root cause lies in the 'TestEmail' feature, which fails to properly sanitize or escape user-supplied input in the recipient address field ('addr1') before passing it to system shell execution utilities.
2. Exploitation Mechanics & Attack Scenario
To exploit this vulnerability, an attacker must first obtain authenticated administrative access to the device's web interface. Once authenticated, the attacker sends a crafted 'TestEmail' API request containing shell metacharacters (such as ';', '&', or '`') followed by arbitrary OS commands within the 'addr1' parameter. The underlying web server executes these commands directly in the system shell, granting the attacker full 'root' level execution privileges on the device's operating system.
3. Infrastructure & Business Impact
As this vulnerability is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, it represents a highly active threat vector. Successful exploitation allows attackers to compromise the physical security infrastructure, hijack live video feeds, modify system configurations, or recruit the compromised IoT devices into malicious botnets for launching distributed denial-of-service (DDoS) attacks.
Official Vendor Advisories & References
On Reolink RLC-410W, C1 Pro, C2 Pro, RLC-422W, and RLC-511W devices through 1.0.227, an authenticated admin can use the "TestEmail" functionality to inject and run OS commands as root, as demonstrated by shell metacharacters in the addr1 field.
Frequently Asked SecOps Questions (CVE-2019-11001)
FAQQ1. How critical is CVE-2019-11001 and is it actively exploited in the wild?
CVE-2019-11001 is rated CVSS 7.2 (HIGH) with a 30-day EPSS exploitation probability of 37.5%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2019-11001?
Primary impacted vendors include reolink across rlc-410w, c1 pro, c2 pro, rlc-422w, rlc-511w. Scope summary: Reolink RLC-410W, C1 Pro, C2 Pro, RLC-422W, and RLC-511W devices through firmware version 1.0.227.
Q3. What temporary mitigations or workarounds exist for CVE-2019-11001 before patching?
[Mitigation] Immediately upgrade to the latest official firmware provided by the manufacturer and restrict network access to the camera's management interface. Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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