CVE-2024-51312 Overview
CVE-2024-51312 is a stack overflow vulnerability in Tenda TX9 firmware version V22.03.02.20. The flaw resides in the sub_42EEE0 function that processes requests to the /goform/SetStaticRouteCfg endpoint. Unauthenticated attackers can reach this endpoint over the network and corrupt the router's stack. Successful exploitation can lead to denial of service or arbitrary code execution on the device. The vulnerability is classified as a stack-based buffer overflow [CWE-121].
Critical Impact
Remote, unauthenticated attackers can trigger a stack overflow in the Tenda TX9 router web management interface, potentially resulting in full device compromise.
Affected Products
- Tenda TX9 router
- Firmware version V22.03.02.20
- Web management interface handler /goform/SetStaticRouteCfg
Discovery Timeline
- 2026-07-20 - CVE-2024-51312 published to NVD
- 2026-07-21 - Last updated in NVD database
Technical Details for CVE-2024-51312
Vulnerability Analysis
The vulnerability exists in the sub_42EEE0 function inside the Tenda TX9 web server binary. This function handles HTTP POST requests directed to the /goform/SetStaticRouteCfg endpoint, which configures static routing entries on the router. User-controlled parameters submitted to this endpoint are copied into a fixed-size stack buffer without proper length validation. An attacker who submits an oversized parameter value overwrites adjacent stack memory, including the saved return address.
Because the endpoint is exposed by the router's HTTP administrative interface and no authentication is required to reach the vulnerable code path, an attacker on the same network segment or one with reachability to the management port can trigger the flaw directly. On embedded MIPS or ARM router platforms lacking modern exploit mitigations such as stack canaries and full ASLR, this class of overflow commonly enables reliable remote code execution as root.
Root Cause
The root cause is missing bounds checking on attacker-controlled input processed by sub_42EEE0. The function trusts the length of parameters received from the HTTP request body and performs an unbounded copy into a local stack buffer, satisfying the definition of a classic stack-based buffer overflow [CWE-121].
Attack Vector
Exploitation requires network access to the router's web management interface and a single crafted HTTP POST request to /goform/SetStaticRouteCfg containing an oversized parameter value. No credentials or user interaction are required. Successful exploitation can crash the device (denial of service) or, with a targeted payload, hijack control flow to execute arbitrary code. Refer to the Gitee IoT Vulnerability Analysis for technical reverse engineering details.
Detection Methods for CVE-2024-51312
Indicators of Compromise
- Unexpected HTTP POST requests to /goform/SetStaticRouteCfg originating from untrusted hosts.
- Router reboots, crashes, or web interface unavailability following administrative requests.
- Unusual outbound connections initiated by the router after receiving requests to the affected endpoint.
Detection Strategies
- Inspect HTTP request bodies to /goform/SetStaticRouteCfg for parameter values exceeding expected route configuration lengths.
- Enable syslog forwarding from the router to a central log collector and alert on repeated administrative request failures.
- Use network intrusion detection signatures that flag oversized POST bodies targeting Tenda /goform/ endpoints.
Monitoring Recommendations
- Continuously monitor router availability and management interface response codes.
- Track configuration changes to static routing tables and alert on unauthorized modifications.
- Log and review all source IPs contacting the router administrative interface.
How to Mitigate CVE-2024-51312
Immediate Actions Required
- Restrict access to the router's web management interface to trusted management VLANs or specific administrator IP addresses.
- Disable remote WAN-side administration if it is currently enabled.
- Segment IoT and network infrastructure devices away from general user and server networks.
Patch Information
No vendor patch is referenced in the published advisory at this time. Check the Tenda Firmware Download Page for updated firmware releases addressing CVE-2024-51312, and apply any newer firmware version once available.
Workarounds
- Block external access to TCP ports serving the router administrative HTTP interface at the network perimeter.
- Place vulnerable Tenda TX9 devices behind a firewall that filters HTTP requests to /goform/SetStaticRouteCfg.
- Consider replacing end-of-support or unpatched consumer-grade routers with vendor-supported alternatives.
# Example: block WAN-side access to the router admin interface using iptables on an upstream gateway
iptables -A FORWARD -p tcp -d <router_ip> --dport 80 -i <wan_iface> -j DROP
iptables -A FORWARD -p tcp -d <router_ip> --dport 443 -i <wan_iface> -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
