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CVE-2026-7747

Status: DeferredHigh (8.9)—

A security flaw has been discovered in Totolink N300RH 3.2.4-B20220812. Affected by this vulnerability is the function loginauth of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. Performing a manipulation of the argument Password results in buffer overflow. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks.

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 parámetro remoto sin autenticación (AV:N, PR:N, UI:N) en función de login de router, permite ejecución de código remoto y potencialmente escalada de privilegios.

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

Privileged Account ManagementExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate SoftwareVulnerability Scanning

Affected technologies (1)

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

Totolink — N300rhAI

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2026-7747",
  "cveTags": [],
  "metrics": {
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          "id": "CVE-2026-7747",
          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "poc"
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            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
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          "version": "2.0.3",
          "timestamp": "2026-05-04T12:43:10.785712Z"
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          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C",
          "authentication": "NONE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "COMPLETE"
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        "acInsufInfo": false,
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        "obtainAllPrivilege": false,
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        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
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        "type": "Secondary",
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          "scope": "UNCHANGED",
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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",
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          "Automatable": "NOT_DEFINED",
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          "valueDensity": "NOT_DEFINED",
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          "exploitMaturity": "PROOF_OF_CONCEPT",
          "providerUrgency": "NOT_DEFINED",
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          "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",
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          "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:totolink:n300rh_firmware:*:*:*:*:*:*:*:*"
          ],
          "vendor": "Totolink",
          "modules": [
            "Parameter Handler"
          ],
          "product": "N300RH",
          "versions": [
            {
              "status": "affected",
              "version": "3.2.4-B20220812"
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  "published": "2026-05-04T09:16:01.117",
  "references": [
    {
      "url": "https://lavender-bicycle-a5a.notion.site/TOTOLINK-N300RH-loginauth_password-34553a41781f80c0ad36f4d95122fd40?pvs=73",
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    {
      "url": "https://vuldb.com/submit/807201",
      "source": "cna@vuldb.com"
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    {
      "url": "https://vuldb.com/vuln/360922",
      "source": "cna@vuldb.com"
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    {
      "url": "https://vuldb.com/vuln/360922/cti",
      "source": "cna@vuldb.com"
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    {
      "url": "https://www.totolink.net/",
      "source": "cna@vuldb.com"
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          "value": "CWE-119"
        },
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          "lang": "en",
          "value": "CWE-120"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A security flaw has been discovered in Totolink N300RH 3.2.4-B20220812. Affected by this vulnerability is the function loginauth of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. Performing a manipulation of the argument Password results in buffer overflow. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks."
    }
  ],
  "lastModified": "2026-06-17T11:02:55.167",
  "sourceIdentifier": "cna@vuldb.com"
}