CVE-2024-51314 Overview
CVE-2024-51314 is a stack overflow vulnerability in the Tenda TX9 router running firmware version V22.03.02.20. The flaw resides in the sub_424CE0 function that processes requests to the /goform/setMacFilterCfg endpoint. Unauthenticated attackers on the network can send crafted HTTP requests to trigger the overflow. Successful exploitation can lead to arbitrary code execution on the device or a denial of service. The vulnerability is classified under CWE-121: Stack-based Buffer Overflow.
Critical Impact
Network-adjacent attackers can execute arbitrary code on affected Tenda TX9 routers without authentication, potentially gaining full control of the device and pivoting into internal networks.
Affected Products
- Tenda TX9 router
- Firmware version V22.03.02.20
- MAC filter configuration handler (/goform/setMacFilterCfg)
Discovery Timeline
- 2026-07-20 - CVE-2024-51314 published to NVD
- 2026-07-21 - Last updated in NVD database
Technical Details for CVE-2024-51314
Vulnerability Analysis
The vulnerability affects the HTTP request handler for MAC address filter configuration on the Tenda TX9 router. When a client submits a request to /goform/setMacFilterCfg, the sub_424CE0 function processes user-supplied parameters and writes them into a fixed-size stack buffer without proper bounds checking. Attackers can supply an oversized value to overwrite the return address on the stack. This allows control of program execution flow on the MIPS-based embedded system. Because the web management interface accepts requests without authentication for this endpoint, exploitation requires only network reachability to the router.
Root Cause
The root cause is missing length validation in sub_424CE0 before copying attacker-controlled input into a stack buffer. The function trusts request parameters and performs an unbounded copy operation, satisfying the classic conditions for a stack-based buffer overflow [CWE-121]. Embedded router firmware often lacks compiler mitigations such as stack canaries, ASLR, or non-executable stacks, which increases exploitability.
Attack Vector
An attacker sends a crafted HTTP POST request to the /goform/setMacFilterCfg endpoint on the router's web management interface. The request contains an oversized parameter that overflows the target stack buffer inside sub_424CE0. Depending on the payload, the attacker can crash the router, hijack execution to injected shellcode, or return into existing firmware code. Refer to the Gitee IoT Vulnerability Documentation for technical proof-of-concept details.
No verified public exploit code is included here. See the linked advisory for reproduction details.
Detection Methods for CVE-2024-51314
Indicators of Compromise
- Unexpected HTTP POST requests to /goform/setMacFilterCfg from untrusted hosts on the LAN or WAN interface.
- Router crashes, spontaneous reboots, or degraded web UI responsiveness following inbound HTTP traffic.
- Outbound connections from the router to unfamiliar external IP addresses after receiving malformed requests.
Detection Strategies
- Inspect HTTP request bodies destined for /goform/setMacFilterCfg for parameter values that exceed expected MAC address length (17 characters).
- Deploy IDS/IPS signatures that flag oversized POST payloads targeting Tenda /goform/ endpoints.
- Correlate router syslog reboot events with preceding HTTP traffic to the management interface.
Monitoring Recommendations
- Log all administrative HTTP requests to router management interfaces and forward them to a central SIEM for analysis.
- Monitor DNS and NetFlow telemetry for anomalous traffic originating from router IP addresses.
- Alert on any exposure of the router web management interface to the WAN or untrusted network segments.
How to Mitigate CVE-2024-51314
Immediate Actions Required
- Restrict access to the router's web management interface to trusted management VLANs or hosts only.
- Disable remote WAN administration if it is enabled on the affected device.
- Change default administrative credentials and audit MAC filter configurations for unauthorized changes.
Patch Information
At the time of publication, no fixed firmware version has been referenced in the NVD entry. Check the Tenda Firmware Update Page for the latest TX9 firmware releases and apply any updates that address setMacFilterCfg. If no patched firmware is available, treat the device as end-of-support and plan replacement.
Workarounds
- Block inbound traffic to TCP ports 80 and 443 on the router's WAN interface using upstream firewall rules.
- Place the router behind a network segment that enforces ACLs limiting who can reach the management UI.
- Consider replacing affected Tenda TX9 devices with hardware that receives active security maintenance if a vendor patch is not released.
# Example upstream firewall rule to block WAN access to router admin UI
iptables -A FORWARD -d <router_ip> -p tcp --dport 80 -j DROP
iptables -A FORWARD -d <router_ip> -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.
