CVE-2025-7850: TP-Link ER8411 Firmware RCE Vulnerability

CVE-2025-7850 Overview

CVE-2025-7850 is a command injection vulnerability affecting TP-Link Omada gateway devices. The vulnerability can be exploited after administrator authentication on the web portal, allowing authenticated attackers with adjacent network access to execute arbitrary system commands on the affected gateway devices. This vulnerability impacts a wide range of TP-Link enterprise and SOHO gateway products used in business networking environments.

Critical Impact
Authenticated attackers on an adjacent network can achieve complete device compromise through command injection, potentially leading to full control of the network gateway, lateral movement capabilities, and compromise of connected network segments.

Affected Products

TP-Link ER8411 (firmware version 1.3.3 and prior)
TP-Link ER7412-M2 (firmware version 1.1.0 and prior)
TP-Link ER707-M2 (firmware version 1.3.1 and prior)
TP-Link ER7206 (firmware version 2.2.2 and prior)
TP-Link ER605 (firmware version 2.3.1 and prior)
TP-Link ER706W (firmware version 1.2.1 and prior)
TP-Link ER706W-4G (firmware version 1.2.1 and prior)
TP-Link ER7212PC (firmware version 2.1.3 and prior)
TP-Link G36 (firmware version 1.1.4 and prior)
TP-Link G611 (firmware version 1.2.2 and prior)
TP-Link FR365 (firmware version 1.1.10 and prior)
TP-Link FR205 (firmware version 1.0.3 and prior)
TP-Link FR307-M2 (firmware version 1.2.5 and prior)

Discovery Timeline

October 21, 2025 - CVE-2025-7850 published to NVD
October 24, 2025 - Last updated in NVD database

Technical Details for CVE-2025-7850

Vulnerability Analysis

This command injection vulnerability (CWE-78: Improper Neutralization of Special Elements used in an OS Command) exists within the web management portal of TP-Link Omada gateway devices. The flaw allows authenticated administrators with adjacent network access to inject and execute arbitrary operating system commands on the underlying device firmware.

Command injection vulnerabilities in network gateway devices are particularly dangerous because these devices typically operate with elevated privileges and serve as critical network infrastructure components. Successful exploitation could enable an attacker to modify routing configurations, intercept network traffic, establish persistent backdoors, or pivot to attack other systems on the network.

The attack requires the adversary to first authenticate as an administrator to the web portal, which provides some level of mitigation. However, in scenarios involving compromised credentials, insider threats, or weak administrative passwords, this prerequisite is easily overcome.

Root Cause

The vulnerability stems from insufficient input sanitization in the web portal interface. User-controlled input passed to system shell commands is not properly validated or escaped, allowing malicious command sequences to be injected and executed by the underlying operating system. This represents a failure to implement proper input validation and output encoding when handling administrator-supplied data that is subsequently used in system command execution contexts.

Attack Vector

The attack requires adjacent network access, meaning the attacker must be on the same network segment as the target device's management interface. The attacker must possess valid administrator credentials to authenticate to the web portal. Once authenticated, specially crafted input containing shell metacharacters or command separators can be submitted through vulnerable web portal functions, resulting in arbitrary command execution with the privileges of the web server process—typically root or equivalent on embedded devices.

The attack complexity is low, requiring no user interaction beyond the initial authentication. Successful exploitation results in high impact to confidentiality, integrity, and availability of the target system, with potential secondary impact to connected network resources.

Detection Methods for CVE-2025-7850

Indicators of Compromise

Unusual administrative login patterns or authentication from unexpected network segments
Anomalous process execution on gateway devices, particularly shell processes spawned by web server components
Unexpected network traffic originating from gateway devices to external destinations
Modified system configurations or unauthorized firmware changes
Presence of unexpected files or scripts in writable filesystem locations

Detection Strategies

Monitor web portal access logs for suspicious request patterns containing shell metacharacters (;, |, &&, ||, $(), backticks)
Implement network segmentation monitoring to detect lateral movement attempts from gateway devices
Deploy network intrusion detection signatures targeting command injection payload patterns in HTTP traffic
Enable authentication logging and alert on administrative access from non-standard IP addresses or times

Monitoring Recommendations

Establish baseline network behavior for gateway management interfaces and alert on deviations
Implement centralized logging for all Omada gateway web portal access attempts
Monitor for outbound connections from gateway devices to uncommon destinations
Review administrative account usage patterns regularly for signs of compromise

How to Mitigate CVE-2025-7850

Immediate Actions Required

Apply firmware updates from TP-Link as referenced in the Omada Networks Security Advisory
Restrict administrative access to gateway web portals to trusted management VLANs or IP addresses only
Review and rotate all administrative credentials for affected devices
Enable multi-factor authentication if supported by your Omada controller deployment
Audit administrative access logs for any suspicious activity prior to patching

Patch Information

TP-Link has released security updates addressing this vulnerability. Administrators should consult the official Omada Networks security document for specific firmware versions and download links for each affected device model. Organizations should prioritize patching based on device exposure and criticality within their network architecture.

Workarounds

Isolate management interfaces on dedicated VLANs inaccessible from general user networks
Implement firewall rules restricting web portal access to specific trusted administrator workstations
Disable remote web management if not required and use local console access only
Deploy a VPN requirement for all administrative access to gateway management interfaces
Consider implementing additional network access controls to limit adjacent network attack surface

bash

# Example: Restrict management interface access via firewall rules
# Note: Actual syntax varies by gateway model and management method

# Limit web portal access to management workstation only
iptables -A INPUT -p tcp --dport 443 -s 192.168.1.10/32 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP

# Alternative: Configure management VLAN isolation
# Ensure gateway management interface is only accessible from VLAN 100
# Configure appropriate ACLs on upstream switches