CVE-2025-14015 Overview
A buffer overflow vulnerability has been identified in H3C Magic B0 routers running firmware versions up to 100R002. This weakness affects the EditWlanMacList function within the /goform/aspForm file, where improper handling of the param argument can lead to a classic buffer overflow condition. Remote exploitation of this vulnerability is possible, potentially allowing attackers to compromise affected network devices.
Critical Impact
Remote attackers can exploit this buffer overflow to potentially execute arbitrary code or cause denial of service on H3C Magic B0 routers, compromising network infrastructure security.
Affected Products
- H3C Magic B0 Firmware (versions up to 100R002)
- H3C Magic B0 Hardware Device
Discovery Timeline
- December 4, 2025 - CVE-2025-14015 published to NVD
- December 23, 2025 - Last updated in NVD database
Technical Details for CVE-2025-14015
Vulnerability Analysis
This vulnerability is classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-120 (Buffer Copy without Checking Size of Input). The EditWlanMacList function in the H3C Magic B0 router firmware fails to properly validate the length of user-supplied input through the param argument before copying it into a fixed-size buffer.
When processing requests to the /goform/aspForm endpoint, the firmware does not implement adequate bounds checking, allowing an attacker to supply oversized input that overflows the destination buffer. This memory corruption can overwrite adjacent memory regions, potentially including return addresses or function pointers, which could be leveraged for code execution.
The vendor was contacted early about this disclosure but did not respond in any way, leaving affected devices potentially vulnerable in the field.
Root Cause
The root cause of this vulnerability is improper input validation in the EditWlanMacList function. The firmware fails to verify that the length of the param argument does not exceed the allocated buffer size before performing memory copy operations. This classic buffer overflow pattern occurs when fixed-size buffers are used without corresponding length checks on user-controlled input.
Attack Vector
This vulnerability is exploitable remotely over the network. An authenticated attacker with low-level privileges can send specially crafted HTTP requests to the /goform/aspForm endpoint with a malicious param argument value. The attack does not require user interaction and can be automated.
The exploitation technique involves sending an HTTP request with an oversized param value to trigger the buffer overflow condition in the EditWlanMacList function. Technical details and proof-of-concept information have been documented in the GitHub Log Attack Documentation.
Detection Methods for CVE-2025-14015
Indicators of Compromise
- Unusual HTTP POST requests to /goform/aspForm containing abnormally large param values
- Router crashes or unexpected reboots indicating potential exploitation attempts
- Anomalous network traffic originating from the router's management interface
- Unexpected changes to WLAN MAC list configurations
Detection Strategies
- Deploy network intrusion detection signatures to identify oversized HTTP requests targeting /goform/aspForm
- Monitor router management interface access logs for unusual request patterns or repeated access attempts
- Implement web application firewall rules to block requests with excessively long parameter values
- Configure alerting for router crashes or service restarts that may indicate exploitation
Monitoring Recommendations
- Enable comprehensive logging on H3C Magic B0 devices and forward logs to a centralized SIEM
- Monitor for authentication attempts and access patterns to the router's web management interface
- Establish baseline network behavior to detect anomalous traffic from affected devices
- Regularly review firmware versions across deployed H3C Magic B0 devices
How to Mitigate CVE-2025-14015
Immediate Actions Required
- Restrict network access to the router's web management interface to trusted IP addresses only
- Disable remote management features if not required for operations
- Place affected devices behind a properly configured firewall
- Monitor for any vendor security advisories or firmware updates from H3C
Patch Information
At the time of disclosure, no vendor patch is available. The vendor was contacted regarding this vulnerability but did not respond. Affected organizations should monitor H3C's official channels for future security updates and apply patches as soon as they become available.
For additional technical information, refer to:
Workarounds
- Implement network segmentation to isolate H3C Magic B0 devices from untrusted networks
- Configure access control lists (ACLs) to restrict management interface access to authorized administrators only
- Consider deploying an additional network security appliance in front of vulnerable devices
- If feasible, replace vulnerable devices with alternative hardware until a patch is available
# Example: Restrict management interface access via upstream firewall
# Block external access to router management port
iptables -A FORWARD -d <ROUTER_IP> -p tcp --dport 80 -j DROP
iptables -A FORWARD -d <ROUTER_IP> -p tcp --dport 443 -j DROP
# Allow management only from trusted admin subnet
iptables -I FORWARD -s 192.168.1.0/24 -d <ROUTER_IP> -p tcp --dport 80 -j ACCEPT
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
