CVE-2025-11665: D-Link DAP-2695 Firmware RCE Vulnerability

CVE-2025-11665 Overview

A command injection vulnerability has been identified in the D-Link DAP-2695 wireless access point, specifically affecting firmware version 2.00RC131. The vulnerability exists within the fwupdater_main function located in the rgbin file, which is part of the Firmware Update Handler component. Attackers with administrative access can exploit this flaw remotely to inject and execute arbitrary operating system commands on the affected device. This vulnerability exclusively impacts products that have reached end-of-life and are no longer receiving security updates from D-Link.

Critical Impact

Remote OS command injection in end-of-life networking equipment allows authenticated attackers to gain complete control over the access point, potentially compromising network infrastructure and enabling lateral movement.

Affected Products

• D-Link DAP-2695 Firmware version 2.00RC131
• D-Link DAP-2695 Hardware Device

Discovery Timeline

• 2025-10-13 - CVE-2025-11665 published to NVD
• 2025-11-03 - Last updated in NVD database

Technical Details for CVE-2025-11665

Vulnerability Analysis

This vulnerability is classified as OS Command Injection (CWE-78) and Command Injection (CWE-77). The flaw resides in the firmware update handling mechanism of the D-Link DAP-2695 access point. The fwupdater_main function within the rgbin binary fails to properly sanitize user-supplied input before passing it to operating system command execution functions. When processing firmware update requests, the handler incorporates attacker-controlled data directly into shell commands without adequate validation or escaping.

The network-accessible nature of this vulnerability means that an authenticated attacker with administrative privileges can remotely trigger the vulnerable code path through the device's management interface. Given that the D-Link DAP-2695 is enterprise-grade networking equipment often deployed in business environments, successful exploitation could provide attackers with a foothold for further network compromise.

Root Cause

The root cause of CVE-2025-11665 is improper input validation within the firmware update handler. The fwupdater_main function in the rgbin binary accepts external input related to firmware update operations and constructs OS commands without proper sanitization. This allows metacharacters and command delimiters to be interpreted by the underlying shell, enabling arbitrary command execution. The lack of input filtering, command parameterization, or secure coding practices in the firmware update workflow creates the exploitable condition.

Attack Vector

The attack vector is network-based, requiring the attacker to have authenticated administrative access to the device's management interface. The exploitation flow involves:

1. Attacker authenticates to the DAP-2695 management interface with administrative credentials
2. Attacker initiates a firmware update request with specially crafted input containing OS command injection payloads
3. The fwupdater_main function processes the malicious input without sanitization
4. Injected commands are executed with the privileges of the firmware update process, typically root-level on embedded devices
5. Attacker achieves arbitrary command execution on the access point

The vulnerability is particularly concerning because embedded devices like the DAP-2695 typically run processes with elevated privileges, and the device is no longer receiving security patches from D-Link.

Detection Methods for CVE-2025-11665

Indicators of Compromise

• Unusual outbound network connections originating from the DAP-2695 device to unexpected external IP addresses
• Unexpected processes or shell sessions spawned by the rgbin binary or firmware update components
• Anomalous log entries indicating firmware update operations with unusual parameters or error messages
• Modified system files or configurations on the access point that were not authorized by administrators

Detection Strategies

• Monitor network traffic to and from DAP-2695 devices for suspicious command-and-control patterns or data exfiltration
• Implement network segmentation to isolate end-of-life devices and enable easier monitoring of their traffic patterns
• Deploy network-based intrusion detection rules to identify command injection payloads in HTTP requests to device management interfaces
• Conduct periodic firmware integrity checks where possible to detect unauthorized modifications

Monitoring Recommendations

• Establish baseline behavior for management interface access and alert on anomalous administrative login patterns
• Log all administrative access attempts to affected D-Link devices and review regularly for unauthorized access
• Monitor for DNS queries or network connections from the access point that deviate from expected operational patterns

How to Mitigate CVE-2025-11665

Immediate Actions Required

• Replace affected D-Link DAP-2695 devices with supported hardware that receives active security updates
• Restrict network access to the device management interface using firewall rules and ACLs to limit administrative access to trusted IP addresses only
• Implement strong, unique administrative credentials and enable multi-factor authentication if supported
• Isolate affected devices on a dedicated management VLAN with strict access controls

Patch Information

D-Link has indicated that the DAP-2695 is an end-of-life product and is no longer receiving security updates. As no official patch is available or expected, organizations must pursue alternative mitigation strategies or device replacement. For additional information, refer to the D-Link Official Website or the VulDB entry #328084 for community tracking of this vulnerability.

Workarounds

• Disable remote management access to the device and only allow local console access for configuration changes
• Implement strict network access control lists (ACLs) limiting which hosts can communicate with the device management interface
• Deploy a web application firewall (WAF) or reverse proxy in front of the management interface to filter potentially malicious firmware update requests
• Consider placing the device behind a VPN to require additional authentication before management access is possible

# Example: Restrict management interface access using firewall rules
# Allow management access only from trusted admin workstation
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.100 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 192.168.1.100 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP