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CVE-2026-9443

Status: DeferredHigh (7.4)—

A security vulnerability has been detected in Edimax BR-6478AC 1.23. This vulnerability affects the function formL2TPSetup of the file /goform/formL2TPSetup of the component POST Request Handler. The manipulation of the argument L2TPUserName leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

Buffer overflow en servicio remoto (POST /goform/formL2TPSetup) accesible con autenticación (PR:L). Permite ejecución de código y potencial escalada de privilegios en router Edimax BR-6478AC.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Threat Intelligence ProgramPrivileged Account ManagementExecution PreventionDisable or Remove Feature or ProgramApplication Isolation and SandboxingExploit Protection

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Edimax — Br-6478acAI

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2026-9443",
  "cveTags": [],
  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-9443",
          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "poc"
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              "automatable": "no"
            },
            {
              "technicalImpact": "total"
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          "version": "2.0.3",
          "timestamp": "2026-05-26T13:13:14.868023Z"
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          "vectorString": "AV:N/AC:L/Au:S/C:C/I:C/A:C",
          "authentication": "SINGLE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "COMPLETE"
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        "acInsufInfo": false,
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        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
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        "type": "Secondary",
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        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
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    ],
    "cvssMetricV40": [
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        "type": "Secondary",
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        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 7.4,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
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          "valueDensity": "NOT_DEFINED",
          "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",
          "exploitMaturity": "PROOF_OF_CONCEPT",
          "providerUrgency": "NOT_DEFINED",
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          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "HIGH",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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  },
  "affected": [
    {
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      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:o:edimax:br-6478ac_firmware:*:*:*:*:*:*:*:*"
          ],
          "vendor": "Edimax",
          "modules": [
            "POST Request Handler"
          ],
          "product": "BR-6478AC",
          "versions": [
            {
              "status": "affected",
              "version": "1.23"
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  "published": "2026-05-25T10:16:16.127",
  "references": [
    {
      "url": "https://lavender-bicycle-a5a.notion.site/EDIMAX-BR6478ACV2-formL2TPSetup-34b53a41781f809e9c30c1260cc5d92e?source=copy_link",
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    },
    {
      "url": "https://vuldb.com/submit/818452",
      "source": "cna@vuldb.com"
    },
    {
      "url": "https://vuldb.com/vuln/365424",
      "source": "cna@vuldb.com"
    },
    {
      "url": "https://vuldb.com/vuln/365424/cti",
      "source": "cna@vuldb.com"
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  "weaknesses": [
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      "type": "Secondary",
      "source": "cna@vuldb.com",
      "description": [
        {
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          "value": "CWE-119"
        },
        {
          "lang": "en",
          "value": "CWE-120"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A security vulnerability has been detected in Edimax BR-6478AC 1.23. This vulnerability affects the function formL2TPSetup of the file /goform/formL2TPSetup of the component POST Request Handler. The manipulation of the argument L2TPUserName leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way."
    },
    {
      "lang": "es",
      "value": "Se ha detectado una vulnerabilidad de seguridad en Edimax BR-6478AC 1.23. Esta vulnerabilidad afecta a la función formL2TPSetup del archivo /goform/formL2TPSetup del componente Gestor de Solicitudes POST. La manipulación del argumento L2TPUserName conduce a desbordamiento de búfer. El ataque puede iniciarse remotamente. El exploit ha sido divulgado públicamente y puede ser utilizado. El proveedor fue contactado con antelación sobre esta divulgación pero no respondió de ninguna manera."
    }
  ],
  "lastModified": "2026-07-23T11:10:00.120",
  "sourceIdentifier": "cna@vuldb.com"
}