CVE-2025-45057 Overview
A buffer overflow vulnerability has been discovered in the D-Link DI-8300 router firmware version 16.07.26A1. The vulnerability exists in the ip_position_asp function, which fails to properly validate the ip parameter before processing. This allows remote attackers to trigger a Denial of Service (DoS) condition by sending specially crafted input to the affected device.
Critical Impact
Remote attackers can render D-Link DI-8300 routers unresponsive without authentication, potentially disrupting network connectivity for all connected devices in home or small business environments.
Affected Products
- D-Link DI-8300 Firmware Version 16.07.26A1
- D-Link DI-8300 Series Routers
Discovery Timeline
- April 8, 2026 - CVE-2025-45057 published to NVD
- April 9, 2026 - Last updated in NVD database
Technical Details for CVE-2025-45057
Vulnerability Analysis
This vulnerability is classified as CWE-120 (Buffer Copy without Checking Size of Input), commonly known as a classic buffer overflow. The ip_position_asp function within the D-Link DI-8300 firmware accepts the ip parameter from user-supplied input but fails to implement proper bounds checking before copying the data into a fixed-size buffer.
When an attacker supplies an oversized value for the ip parameter, the function copies the entire input into the buffer, overwriting adjacent memory regions. This memory corruption leads to device instability and crashes, resulting in a Denial of Service condition. The vulnerability is exploitable remotely over the network without requiring any authentication credentials or user interaction.
Root Cause
The root cause of this vulnerability is insufficient input validation in the ip_position_asp function. The function does not verify the length of the ip parameter before copying it to an internal buffer. This classic buffer overflow pattern occurs when developers use unsafe memory copy operations without first validating that the source data fits within the destination buffer's allocated size. In embedded devices like routers, such vulnerabilities are particularly dangerous as firmware is often compiled without modern memory protection mechanisms like stack canaries or ASLR.
Attack Vector
The attack is network-based, meaning an attacker can exploit this vulnerability remotely. The attacker sends a malicious HTTP request to the router's web management interface containing an oversized ip parameter value. When the ip_position_asp function processes this request, it attempts to copy the oversized input into a fixed-size buffer, causing memory corruption and crashing the device.
The attack requires no authentication and no user interaction, making it particularly dangerous for internet-exposed devices. An attacker only needs network access to the router's management interface to trigger the vulnerability. The exploitation results in a denial of service where the router becomes unresponsive and may require a manual reboot to restore functionality.
Detection Methods for CVE-2025-45057
Indicators of Compromise
- Unexpected router reboots or crashes without apparent cause
- Abnormally large HTTP requests targeting the router's web management interface
- Network logs showing requests with oversized ip parameter values to router administration pages
- Increased crash dump files or error logs in router diagnostics
Detection Strategies
- Monitor network traffic for HTTP requests with unusually large parameter values targeting D-Link router interfaces
- Implement IDS/IPS rules to detect oversized input in web management requests to IoT devices
- Configure alerting for repeated router restarts or availability issues
- Deploy network segmentation to isolate router management interfaces from untrusted networks
Monitoring Recommendations
- Enable logging on the D-Link DI-8300 and forward logs to a central SIEM for analysis
- Monitor for repeated connection attempts to the router's web management ports (typically 80, 443, or 8080)
- Set up availability monitoring for critical network devices to detect DoS conditions quickly
- Review network traffic patterns for anomalies targeting embedded device management interfaces
How to Mitigate CVE-2025-45057
Immediate Actions Required
- Disable remote management access to the D-Link DI-8300 if not required
- Restrict access to the router's web management interface to trusted IP addresses only
- Place the router behind a firewall that blocks untrusted external access to management ports
- Check the D-Link Security Bulletin for firmware updates addressing this vulnerability
Patch Information
As of the last update on April 9, 2026, users should consult the D-Link Product Information page and D-Link Security Bulletin for the latest firmware releases that address this vulnerability. Users running firmware version 16.07.26A1 should upgrade to the latest available firmware as soon as a patched version is released.
For additional technical details about this vulnerability, refer to the GitHub IoT Vulnerability Collection.
Workarounds
- Disable the web management interface entirely and manage the device through local console access only
- Implement network-level access controls (ACLs) to restrict management interface access to specific administrator IP addresses
- Deploy a web application firewall (WAF) or reverse proxy in front of the management interface to filter oversized requests
- Consider replacing end-of-life or unpatched devices with newer models that receive regular security updates
# Example firewall rule to restrict management interface access (iptables)
# Allow management access only from trusted admin subnet
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
# Block oversized packets that may be used in buffer overflow attacks
iptables -A INPUT -p tcp --dport 80 -m length --length 8192:65535 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
