CVE-2025-7598 Overview
CVE-2025-7598 is a stack-based buffer overflow vulnerability in the Tenda AX1803 router running firmware version 1.0.0.1. The flaw resides in the formSetWifiMacFilterCfg function handling requests to the /goform/setWifiFilterCfg endpoint. Attackers manipulate the deviceList argument to overflow a fixed-size stack buffer. The issue is classified under [CWE-119] (Improper Restriction of Operations within the Bounds of a Memory Buffer). The exploit details have been disclosed publicly, increasing the likelihood of opportunistic exploitation against exposed devices.
Critical Impact
Remote attackers with low-privilege access can corrupt stack memory on the router, potentially achieving arbitrary code execution or denial of service against the device.
Affected Products
- Tenda AX1803 (hardware)
- Tenda AX1803 Firmware version 1.0.0.1
- Endpoint: /goform/setWifiFilterCfg handled by formSetWifiMacFilterCfg
Discovery Timeline
- 2025-07-14 - CVE-2025-7598 published to NVD
- 2025-07-16 - Last updated in NVD database
Technical Details for CVE-2025-7598
Vulnerability Analysis
The vulnerability exists in the Wi-Fi MAC filter configuration handler exposed by the AX1803 web management interface. When an HTTP request is sent to /goform/setWifiFilterCfg, the formSetWifiMacFilterCfg function reads the deviceList parameter from the request body. The function copies this attacker-controlled string into a fixed-size stack buffer without validating its length. Supplying an oversized deviceList value overruns the buffer and corrupts adjacent stack memory, including saved return addresses on the MIPS/ARM-based device.
According to the public GitHub PoC repository, the issue is reachable over the network with low privileges. The EPSS score is 1.566% at the 81.8 percentile, indicating elevated exploitation probability compared to the average CVE.
Root Cause
The root cause is the absence of bounds checking on the deviceList parameter before invoking an unsafe string copy into a stack-allocated buffer. The handler trusts the length of attacker-supplied input, which is a classic [CWE-119] memory safety failure common in embedded HTTP servers running on consumer routers.
Attack Vector
An authenticated attacker on the same network or, where remote management is enabled, an internet-based attacker sends a crafted POST request to /goform/setWifiFilterCfg with an oversized deviceList field. Successful exploitation can crash the httpd process, brick the device until reboot, or allow control-flow hijacking that leads to arbitrary code execution on the router.
No verified exploit code is reproduced here. Technical details and the proof-of-concept are documented in the public PoC writeup and VulDB entry 316297.
Detection Methods for CVE-2025-7598
Indicators of Compromise
- Unexpected reboots or httpd crashes on the Tenda AX1803 management interface
- HTTP POST requests to /goform/setWifiFilterCfg containing abnormally long deviceList parameter values
- Loss of management interface responsiveness following requests from untrusted source IPs
- Anomalous outbound connections from the router after receiving crafted MAC filter configuration requests
Detection Strategies
- Inspect HTTP traffic destined for the router management interface for deviceList parameter lengths exceeding expected bounds (typical MAC address lists)
- Deploy network IDS signatures matching POST requests to /goform/setWifiFilterCfg containing oversized payloads
- Correlate router crash events with preceding inbound HTTP requests to identify exploitation attempts
Monitoring Recommendations
- Forward router syslog data to a centralized logging platform and alert on repeated httpd restarts
- Monitor for unauthorized configuration changes in the Wi-Fi MAC filter settings
- Track scanning activity against TCP ports hosting the router web interface from internal and external sources
How to Mitigate CVE-2025-7598
Immediate Actions Required
- Disable remote (WAN-side) administration on the Tenda AX1803 to block internet-based exploitation
- Restrict LAN-side access to the management interface to a dedicated administrative VLAN or trusted host
- Rotate administrative credentials, since exploitation requires low-privileged authenticated access
- Treat any AX1803 device exposing /goform/setWifiFilterCfg to untrusted networks as at-risk and isolate it
Patch Information
At the time of NVD publication, no vendor patch has been linked in the advisory. Refer to the Tenda official website for firmware updates beyond version 1.0.0.1. If no fixed firmware is available, consider replacing the device with a supported model.
Workarounds
- Block inbound HTTP/HTTPS access to the router management interface at the network perimeter
- Place the router behind a reverse proxy or firewall that enforces request-size limits on /goform/* endpoints
- Segment IoT and management networks so that compromise of the router does not pivot into production assets
- Disable the Wi-Fi MAC filter feature if it is not in active use to reduce reachable attack surface
# Example firewall rule to restrict router management access to a trusted host
iptables -A INPUT -p tcp --dport 80 -s 192.0.2.10 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -s 192.0.2.10 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
