Vulnerability-Lookup

CVE-2026-20466 (GCVE-0-2026-20466)

Vulnerability from cvelistv5 – Published: 2026-08-03 02:05 – Updated: 2026-08-03 19:38

Summary

In sec boot, there is a possible escalation of privilege due to a heap buffer overflow. This could lead to local escalation of privilege, if an attacker has physical access to the device, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: AUTO00845351 (Note: For MT2737) / ALPS11072643 (Note: For MT6880, MT6890, MT6990); Issue ID: MSV-6929.

Severity

6.1 (Medium)


                        
                          CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-03 19:37 UTC

CWE

CWE-787 - Out-of-bounds Write

Assigner

MediaTek mitre root

References

1 reference

URL	Tags
https://www.mediatek.com/product-security-bulleti…

Impacted products

1 product

Vendor	Product	Version	CPE status
MediaTek, Inc.	MediaTek chipset	Affected: MT2737 Affected: MT6880 Affected: MT6890 Affected: MT6990	guessed

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "PHYSICAL",
              "availabilityImpact": "NONE",
              "baseScore": 6.1,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-20466",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-03T19:37:59.018493Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-03T19:38:19.691Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "MediaTek chipset",
          "vendor": "MediaTek, Inc.",
          "versions": [
            {
              "status": "affected",
              "version": "MT2737"
            },
            {
              "status": "affected",
              "version": "MT6880"
            },
            {
              "status": "affected",
              "version": "MT6890"
            },
            {
              "status": "affected",
              "version": "MT6990"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In sec boot, there is a possible escalation of privilege due to a heap buffer overflow. This could lead to local escalation of privilege, if an attacker has physical access to the device, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: AUTO00845351 (Note: For MT2737) / ALPS11072643 (Note: For MT6880, MT6890, MT6990); Issue ID: MSV-6929."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-787",
              "description": "CWE-787 Out-of-bounds Write",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-03T02:05:17.330Z",
        "orgId": "ee979b05-11f8-4f25-a7e0-a1fa9c190374",
        "shortName": "MediaTek"
      },
      "references": [
        {
          "url": "https://www.mediatek.com/product-security-bulletin/August-2026"
        }
      ],
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ee979b05-11f8-4f25-a7e0-a1fa9c190374",
    "assignerShortName": "MediaTek",
    "cveId": "CVE-2026-20466",
    "datePublished": "2026-08-03T02:05:17.330Z",
    "dateReserved": "2025-11-03T01:30:59.015Z",
    "dateUpdated": "2026-08-03T19:38:19.691Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-20466",
      "date": "2026-08-18",
      "epss": "0.00166",
      "percentile": "0.06262"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-20466\",\"sourceIdentifier\":\"security@mediatek.com\",\"published\":\"2026-08-03T03:16:41.433\",\"lastModified\":\"2026-08-03T20:17:18.230\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In sec boot, there is a possible escalation of privilege due to a heap buffer overflow. This could lead to local escalation of privilege, if an attacker has physical access to the device, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: AUTO00845351 (Note: For MT2737) / ALPS11072643 (Note: For MT6880, MT6890, MT6990); Issue ID: MSV-6929.\"}],\"affected\":[{\"source\":\"security@mediatek.com\",\"affectedData\":[{\"vendor\":\"MediaTek, Inc.\",\"product\":\"MediaTek chipset\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"MT2737\",\"status\":\"affected\"},{\"version\":\"MT6880\",\"status\":\"affected\"},{\"version\":\"MT6890\",\"status\":\"affected\"},{\"version\":\"MT6990\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N\",\"baseScore\":6.1,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"PHYSICAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":0.9,\"impactScore\":5.2}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-08-03T19:37:59.018493Z\",\"id\":\"CVE-2026-20466\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"security@mediatek.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-787\"}]}],\"references\":[{\"url\":\"https://www.mediatek.com/product-security-bulletin/August-2026\",\"source\":\"security@mediatek.com\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 6.1, \"attackVector\": \"PHYSICAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-20466\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-03T19:37:59.018493Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-03T19:38:14.379Z\"}}], \"cna\": {\"affected\": [{\"vendor\": \"MediaTek, Inc.\", \"product\": \"MediaTek chipset\", \"versions\": [{\"status\": \"affected\", \"version\": \"MT2737\"}, {\"status\": \"affected\", \"version\": \"MT6880\"}, {\"status\": \"affected\", \"version\": \"MT6890\"}, {\"status\": \"affected\", \"version\": \"MT6990\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://www.mediatek.com/product-security-bulletin/August-2026\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In sec boot, there is a possible escalation of privilege due to a heap buffer overflow. This could lead to local escalation of privilege, if an attacker has physical access to the device, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: AUTO00845351 (Note: For MT2737) / ALPS11072643 (Note: For MT6880, MT6890, MT6990); Issue ID: MSV-6929.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-787\", \"description\": \"CWE-787 Out-of-bounds Write\"}]}], \"providerMetadata\": {\"orgId\": \"ee979b05-11f8-4f25-a7e0-a1fa9c190374\", \"shortName\": \"MediaTek\", \"dateUpdated\": \"2026-08-03T02:05:17.330Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-20466\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-03T19:38:19.691Z\", \"dateReserved\": \"2025-11-03T01:30:59.015Z\", \"assignerOrgId\": \"ee979b05-11f8-4f25-a7e0-a1fa9c190374\", \"datePublished\": \"2026-08-03T02:05:17.330Z\", \"assignerShortName\": \"MediaTek\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-20466

Vulnerability from fkie_nvd - Published: 2026-08-03 03:16 - Updated: 2026-08-03 20:17

Severity

6.1 (Medium) - CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Summary

References

	URL	Tags
	security@mediatek.com	https://www.mediatek.com/product-security-bulletin/August-2026

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "MediaTek chipset",
          "vendor": "MediaTek, Inc.",
          "versions": [
            {
              "status": "affected",
              "version": "MT2737"
            },
            {
              "status": "affected",
              "version": "MT6880"
            },
            {
              "status": "affected",
              "version": "MT6890"
            },
            {
              "status": "affected",
              "version": "MT6990"
            }
          ]
        }
      ],
      "source": "security@mediatek.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In sec boot, there is a possible escalation of privilege due to a heap buffer overflow. This could lead to local escalation of privilege, if an attacker has physical access to the device, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: AUTO00845351 (Note: For MT2737) / ALPS11072643 (Note: For MT6880, MT6890, MT6990); Issue ID: MSV-6929."
    }
  ],
  "id": "CVE-2026-20466",
  "lastModified": "2026-08-03T20:17:18.230",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "PHYSICAL",
          "availabilityImpact": "NONE",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 0.9,
        "impactScore": 5.2,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-20466",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-03T19:37:59.018493Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-03T03:16:41.433",
  "references": [
    {
      "source": "security@mediatek.com",
      "url": "https://www.mediatek.com/product-security-bulletin/August-2026"
    }
  ],
  "sourceIdentifier": "security@mediatek.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "security@mediatek.com",
      "type": "Secondary"
    }
  ]
}

GHSA-4FW3-96WH-RV55

Vulnerability from github – Published: 2026-08-03 03:31 – Updated: 2026-08-03 21:31

Details

Severity

6.1 (Medium)


                  
                    CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-20466"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-03T03:16:41Z",
    "severity": "MODERATE"
  },
  "details": "In sec boot, there is a possible escalation of privilege due to a heap buffer overflow. This could lead to local escalation of privilege, if an attacker has physical access to the device, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: AUTO00845351 (Note: For MT2737) / ALPS11072643 (Note: For MT6880, MT6890, MT6990); Issue ID: MSV-6929.",
  "id": "GHSA-4fw3-96wh-rv55",
  "modified": "2026-08-03T21:31:32Z",
  "published": "2026-08-03T03:31:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-20466"
    },
    {
      "type": "WEB",
      "url": "https://www.mediatek.com/product-security-bulletin/August-2026"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-20466 (GCVE-0-2026-20466)

FKIE_CVE-2026-20466

GHSA-4FW3-96WH-RV55

Tags

Sightings

Nomenclature