CVE-2026-17251 (GCVE-0-2026-17251)
Vulnerability from cvelistv5
Published
2026-08-21 17:16
Modified
2026-08-21 17:40
CWE
  • CWE-476 - NULL pointer dereference
Summary
A NULL pointer dereference vulnerability exists in the HTTP request parsing functionality of  TL-MR6400 v7. An unauthenticated remote attacker can trigger the vulnerability by sending a specially crafted HTTP request containing a malformed session cookie header. Successful exploitation may cause the HTTP service process to crash, resulting in a denial-of-service condition and temporary loss of management or CGI functionality until service recovery.
Impacted products
Vendor Product Version
TP-Link Systems Inc. TL-MR6400 v7.0 Version: 0   < 1.9.0 Build 260714
Create a notification for this product.
Show details on NVD website


{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-17251",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-21T17:40:25.485077Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-21T17:40:36.098Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "Linux"
          ],
          "product": "TL-MR6400 v7.0",
          "vendor": "TP-Link Systems Inc.",
          "versions": [
            {
              "lessThan": "1.9.0 Build 260714",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Rui Cheng Yu (Hina)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eA NULL\npointer dereference vulnerability exists in the HTTP request parsing\nfunctionality of\u0026nbsp;\nTL-MR6400 v7. An unauthenticated remote attacker can\ntrigger the vulnerability by sending a specially crafted HTTP request\ncontaining a malformed session cookie header. \u003c/p\u003e\n\n\u003cp\u003eSuccessful\nexploitation may cause the HTTP service process to crash, resulting in a\ndenial-of-service condition and temporary loss of management or CGI\nfunctionality until service recovery.\u003c/p\u003e"
            }
          ],
          "value": "A NULL\npointer dereference vulnerability exists in the HTTP request parsing\nfunctionality of\u00a0\nTL-MR6400 v7. An unauthenticated remote attacker can\ntrigger the vulnerability by sending a specially crafted HTTP request\ncontaining a malformed session cookie header. \n\n\n\n\n\nSuccessful\nexploitation may cause the HTTP service process to crash, resulting in a\ndenial-of-service condition and temporary loss of management or CGI\nfunctionality until service recovery."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-135",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-135 Format String Injection"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "ADJACENT",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "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:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-476",
              "description": "CWE-476 NULL pointer dereference",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-21T17:16:45.791Z",
        "orgId": "f23511db-6c3e-4e32-a477-6aa17d310630",
        "shortName": "TPLink"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://www.tp-link.com/en/support/download/tl-mr6400/v7/#Firmware"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://www.tp-link.com/tw/support/download/tl-mr6400/v7/#Firmware"
        },
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.tp-link.com/us/support/faq/5259/"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Unauthenticated Denial of Service via Null Pointer Dereference in HTTP Request Parsing",
      "x_generator": {
        "engine": "Vulnogram 1.0.4"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f23511db-6c3e-4e32-a477-6aa17d310630",
    "assignerShortName": "TPLink",
    "cveId": "CVE-2026-17251",
    "datePublished": "2026-08-21T17:16:45.791Z",
    "dateReserved": "2026-07-24T22:03:11.872Z",
    "dateUpdated": "2026-08-21T17:40:36.098Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-17251\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-21T17:40:25.485077Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-21T17:40:31.686Z\"}}], \"cna\": {\"title\": \"Unauthenticated Denial of Service via Null Pointer Dereference in HTTP Request Parsing\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Rui Cheng Yu (Hina)\"}], \"impacts\": [{\"capecId\": \"CAPEC-135\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-135 Format String Injection\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 7.1, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"ADJACENT\", \"baseSeverity\": \"HIGH\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N\", \"exploitMaturity\": \"NOT_DEFINED\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"TP-Link Systems Inc.\", \"product\": \"TL-MR6400 v7.0\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"1.9.0 Build 260714\", \"versionType\": \"custom\"}], \"platforms\": [\"Linux\"], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://www.tp-link.com/en/support/download/tl-mr6400/v7/#Firmware\", \"tags\": [\"patch\"]}, {\"url\": \"https://www.tp-link.com/tw/support/download/tl-mr6400/v7/#Firmware\", \"tags\": [\"patch\"]}, {\"url\": \"https://www.tp-link.com/us/support/faq/5259/\", \"tags\": [\"vendor-advisory\"]}], \"x_generator\": {\"engine\": \"Vulnogram 1.0.4\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A NULL\\npointer dereference vulnerability exists in the HTTP request parsing\\nfunctionality of\\u00a0\\nTL-MR6400 v7. An unauthenticated remote attacker can\\ntrigger the vulnerability by sending a specially crafted HTTP request\\ncontaining a malformed session cookie header. \\n\\n\\n\\n\\n\\nSuccessful\\nexploitation may cause the HTTP service process to crash, resulting in a\\ndenial-of-service condition and temporary loss of management or CGI\\nfunctionality until service recovery.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eA NULL\\npointer dereference vulnerability exists in the HTTP request parsing\\nfunctionality of\u0026nbsp;\\nTL-MR6400 v7. An unauthenticated remote attacker can\\ntrigger the vulnerability by sending a specially crafted HTTP request\\ncontaining a malformed session cookie header. \u003c/p\u003e\\n\\n\u003cp\u003eSuccessful\\nexploitation may cause the HTTP service process to crash, resulting in a\\ndenial-of-service condition and temporary loss of management or CGI\\nfunctionality until service recovery.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL pointer dereference\"}]}], \"providerMetadata\": {\"orgId\": \"f23511db-6c3e-4e32-a477-6aa17d310630\", \"shortName\": \"TPLink\", \"dateUpdated\": \"2026-08-21T17:16:45.791Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-17251\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-21T17:40:36.098Z\", \"dateReserved\": \"2026-07-24T22:03:11.872Z\", \"assignerOrgId\": \"f23511db-6c3e-4e32-a477-6aa17d310630\", \"datePublished\": \"2026-08-21T17:16:45.791Z\", \"assignerShortName\": \"TPLink\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.


Loading…

Loading…