FKIE_CVE-2026-9030

Vulnerability from fkie_nvd - Published: 2026-08-07 21:17 - Updated: 2026-08-10 19:17
Severity
6.8 (Medium) - 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
Summary
A denial-of-service vulnerability exists in httpd service on Archer A6 v4 where the asynchronous systool instruction handlng path in httpd does not properly synchronize or safely manage concurrent systool operations.  By sending crafted systool instructions through the asynchronous request path, successful exploitation may cause the httpd process or device management service to crash and may result in temporary loss of access to the web management interface or device reboot.
References
f23511db-6c3e-4e32-a477-6aa17d310630https://www.tp-link.com/en/support/download/archer-a6/v4/#Firmware
f23511db-6c3e-4e32-a477-6aa17d310630https://www.tp-link.com/en/support/faq/5234/
f23511db-6c3e-4e32-a477-6aa17d310630https://www.tp-link.com/us/support/download/archer-a6/v4/#Firmware
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "httpd"
          ],
          "product": "Archer A6 v4",
          "vendor": "TP-Link Systems Inc.",
          "versions": [
            {
              "lessThan": "V4_1.15.10 Build 260625 Rel.25447",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "f23511db-6c3e-4e32-a477-6aa17d310630"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A denial-of-service\nvulnerability exists in httpd service on Archer A6 v4 where the asynchronous systool\ninstruction handlng path in httpd does not properly synchronize or safely manage\nconcurrent systool operations.\u00a0 \n\n\n\n\n\nBy sending\ncrafted systool instructions through the asynchronous request path, successful\nexploitation may cause the httpd process or device management service to crash\nand may result in temporary loss of access to the web management interface or\ndevice reboot."
    }
  ],
  "id": "CVE-2026-9030",
  "lastModified": "2026-08-10T19:17:36.480",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "ADJACENT",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.8,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "HIGH",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "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",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "f23511db-6c3e-4e32-a477-6aa17d310630",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-9030",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-10T17:28:38.437749Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-07T21:17:30.370",
  "references": [
    {
      "source": "f23511db-6c3e-4e32-a477-6aa17d310630",
      "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"
    }
  ],
  "sourceIdentifier": "f23511db-6c3e-4e32-a477-6aa17d310630",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-362"
        }
      ],
      "source": "f23511db-6c3e-4e32-a477-6aa17d310630",
      "type": "Secondary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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