CVE-2025-3499: Unauthenticated RCE Vulnerability

CVE-2025-3499 Overview

CVE-2025-3499 is a critical OS command injection vulnerability affecting a device with two web servers that expose unauthenticated REST APIs on the management network via TCP ports 8084 and 8086. By exploiting this vulnerability, an attacker can send arbitrary commands through these APIs that are executed with administrative permissions by the underlying operating system, leading to complete system compromise.

Critical Impact

This vulnerability allows unauthenticated remote attackers to execute arbitrary operating system commands with administrative privileges, potentially leading to full device takeover, data exfiltration, lateral movement, and persistent access to the management network.

Affected Products

• Devices exposing unauthenticated REST APIs on TCP port 8084
• Devices exposing unauthenticated REST APIs on TCP port 8086
• Management network interfaces with exposed web servers

Discovery Timeline

• 2025-07-09 - CVE-2025-3499 published to NVD
• 2025-07-10 - Last updated in NVD database

Technical Details for CVE-2025-3499

Vulnerability Analysis

This vulnerability represents a severe security flaw classified under CWE-78 (Improper Neutralization of Special Elements used in an OS Command). The affected device runs two web servers on the management network that expose REST API endpoints without requiring any form of authentication. These APIs accept user-supplied input that is subsequently passed to operating system command execution functions without proper sanitization or validation.

The lack of authentication combined with the command injection flaw creates an extremely dangerous attack surface. Any network-adjacent attacker with access to the management network can exploit this vulnerability to gain administrative-level command execution capabilities on the underlying operating system.

Root Cause

The root cause of CVE-2025-3499 lies in two fundamental security failures:

1. Missing Authentication: The REST APIs on TCP ports 8084 and 8086 do not implement any authentication mechanism, allowing any network user to interact with the APIs freely.

2. Improper Input Sanitization: User-supplied input passed to the API endpoints is not properly sanitized before being used in operating system command construction. Special characters and command separators (such as ;, |, &&, or backticks) are not filtered, allowing attackers to break out of the intended command context and inject arbitrary commands.

Attack Vector

The attack vector for this vulnerability is network-based, requiring the attacker to have network access to the management interfaces on TCP ports 8084 or 8086. The exploitation process involves sending specially crafted HTTP requests to the vulnerable REST API endpoints containing malicious payloads in parameter values.

The attacker constructs API requests where input parameters contain OS command injection payloads. When the server processes these requests, it concatenates the malicious input directly into shell commands without sanitization. The injected commands are then executed with the same privileges as the web server process, which in this case operates with administrative permissions.

Due to the unauthenticated nature of the APIs, no credentials or session tokens are required to exploit this vulnerability. An attacker simply needs network connectivity to the target ports and knowledge of the API endpoints.

Detection Methods for CVE-2025-3499

Indicators of Compromise

• Unexpected outbound connections from the affected device to external IP addresses
• Anomalous processes spawned by the web server process on the device
• Suspicious log entries showing unusual API requests to ports 8084 or 8086
• Creation of unauthorized user accounts or SSH keys on the device
• Presence of web shells or reverse shell connections originating from the device

Detection Strategies

• Monitor network traffic to TCP ports 8084 and 8086 for suspicious patterns and command injection payloads
• Implement network-based intrusion detection rules to identify OS command injection attempts in HTTP requests
• Deploy endpoint detection and response (EDR) solutions to monitor for anomalous process execution chains
• Analyze web server logs for requests containing shell metacharacters such as ;, |, &&, $(), or backticks

Monitoring Recommendations

• Configure alerts for any authentication failures or unauthorized access attempts on the management network
• Establish baseline behavior for the affected device and alert on deviations in network traffic or process execution
• Implement continuous monitoring of outbound connections from management network devices
• Review API access logs regularly for signs of reconnaissance or exploitation attempts

How to Mitigate CVE-2025-3499

Immediate Actions Required

• Restrict network access to TCP ports 8084 and 8086 using firewall rules to only trusted management hosts
• Segment the management network from untrusted networks and implement strict access controls
• Disable the vulnerable REST API services if they are not operationally required
• Monitor affected devices for signs of compromise and conduct forensic analysis if exploitation is suspected

Patch Information

For official patch information and remediation guidance, refer to the CVCN CVE-2025-3499 Entry. Organizations should contact the device vendor directly for firmware updates or security patches that address this vulnerability.

Workarounds

• Implement network-level access controls to restrict API access to authorized management stations only
• Deploy a web application firewall (WAF) in front of the affected services to filter command injection attempts
• Use VPN or other secure tunneling solutions to access the management network rather than direct connectivity
• Consider placing the affected device behind a reverse proxy that can sanitize incoming requests

# Example: Firewall rules to restrict access to vulnerable ports
# Allow only trusted management IP to access vulnerable ports
iptables -A INPUT -p tcp --dport 8084 -s 10.0.0.100 -j ACCEPT
iptables -A INPUT -p tcp --dport 8086 -s 10.0.0.100 -j ACCEPT
# Drop all other traffic to vulnerable ports
iptables -A INPUT -p tcp --dport 8084 -j DROP
iptables -A INPUT -p tcp --dport 8086 -j DROP