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CVE-2026-9031

Status: Awaiting AnalysisMedium (6.8)—

An input validation vulnerability exists in the HTTP-WRITEOEM handler due to insufficient validation of user-supplied data before it is processed by internal flash-write handling logic.

Successful exploitation may cause httpd process or device to crash, resulting in loss of access to the web interface and a denial-of-service condition.

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).

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2026-9031",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-9031",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-08-10T17:23:21.410852Z"
        }
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "f23511db-6c3e-4e32-a477-6aa17d310630",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 6.8,
          "Automatable": "NOT_DEFINED",
          "attackVector": "ADJACENT",
          "baseSeverity": "MEDIUM",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/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": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "HIGH",
          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "HIGH",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "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"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "f23511db-6c3e-4e32-a477-6aa17d310630",
      "affectedData": [
        {
          "vendor": "TP-Link Systems Inc.",
          "modules": [
            "httpd"
          ],
          "product": "Archer A6 v4",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "V4_1.15.10 Build 260625 Rel.25447",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-08-07T21:17:30.530",
  "references": [
    {
      "url": "https://www.tp-link.com/en/support/download/archer-a6/v4/#Firmware",
      "source": "f23511db-6c3e-4e32-a477-6aa17d310630"
    },
    {
      "url": "https://www.tp-link.com/en/support/faq/5234/",
      "source": "f23511db-6c3e-4e32-a477-6aa17d310630"
    },
    {
      "url": "https://www.tp-link.com/us/support/download/archer-a6/v4/#Firmware",
      "source": "f23511db-6c3e-4e32-a477-6aa17d310630"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "f23511db-6c3e-4e32-a477-6aa17d310630",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An input validation\nvulnerability exists in the HTTP-WRITEOEM handler due to insufficient validation\nof user-supplied data before it is processed by internal flash-write handling\nlogic.\n\n\n\n\n\n\n\n\n\nSuccessful\nexploitation may cause httpd process or device to crash, resulting in loss of access\nto the web interface and a denial-of-service condition."
    }
  ],
  "lastModified": "2026-08-18T15:04:46.610",
  "sourceIdentifier": "f23511db-6c3e-4e32-a477-6aa17d310630"
}