Vulnerability-Lookup

CVE-2026-20479 (GCVE-0-2026-20479)

Vulnerability from cvelistv5 – Published: 2026-08-03 02:05 – Updated: 2026-08-03 18:59

Summary

In Modem, there is a possible out of bounds read due to a missing bounds check. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY00741071; Issue ID: MSV-7620.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-03 18:58 UTC

CWE

CWE-125 - Out-of-bounds Read

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: MT2735 Affected: MT6833 Affected: MT6853 Affected: MT6855 Affected: MT6873 Affected: MT6875 Affected: MT6877 Affected: MT6880 Affected: MT6883 Affected: MT6885 Affected: MT6889 Affected: MT6890 Affected: MT6891 Affected: MT6893 Affected: MT8675 Affected: MT8771 Affected: MT8791 Affected: MT8791T Affected: MT8797	guessed

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}

FKIE_CVE-2026-20479

Vulnerability from fkie_nvd - Published: 2026-08-03 03:16 - Updated: 2026-08-19 17:17

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

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

Impacted products

Vendor	Product	Version
mediatek	mt2735_firmware	-
mediatek	mt2735	-
mediatek	mt6833_firmware	-
mediatek	mt6833	-
mediatek	mt6853_firmware	-
mediatek	mt6853	-
mediatek	mt6855_firmware	-
mediatek	mt6855	-
mediatek	mt6873_firmware	-
mediatek	mt6873	-
mediatek	mt6875_firmware	-
mediatek	mt6875	-
mediatek	mt6877_firmware	-
mediatek	mt6877	-
mediatek	mt6880_firmware	-
mediatek	mt6880	-
mediatek	mt6883_firmware	-
mediatek	mt6883	-
mediatek	mt6885_firmware	-
mediatek	mt6885	-
mediatek	mt6889_firmware	-
mediatek	mt6889	-
mediatek	mt6890_firmware	-
mediatek	mt6890	-
mediatek	mt6891_firmware	-
mediatek	mt6891	-
mediatek	mt6893_firmware	-
mediatek	mt6893	-
mediatek	mt8675_firmware	-
mediatek	mt8675	-
mediatek	mt8771_firmware	-
mediatek	mt8771	-
mediatek	mt8791_firmware	-
mediatek	mt8791	-
mediatek	mt8791t_firmware	-
mediatek	mt8791t	-
mediatek	mt8797_firmware	-
mediatek	mt8797	-

JSON

To clipboard

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  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "MediaTek chipset",
          "vendor": "MediaTek, Inc.",
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            },
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            },
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            },
            {
              "status": "affected",
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            },
            {
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              "version": "MT6873"
            },
            {
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              "version": "MT6875"
            },
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            },
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            },
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            },
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            },
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            },
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            },
            {
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            },
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            },
            {
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            },
            {
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            },
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            }
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  "lastModified": "2026-08-19T17:17:08.190",
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          "baseScore": 7.5,
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          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
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}

GHSA-6G35-P5GH-6QH4

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

Details

Severity

7.5 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-20479"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-03T03:16:42Z",
    "severity": "HIGH"
  },
  "details": "In Modem, there is a possible out of bounds read due to a missing bounds check. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY00741071; Issue ID: MSV-7620.",
  "id": "GHSA-6g35-p5gh-6qh4",
  "modified": "2026-08-03T21:31:33Z",
  "published": "2026-08-03T03:31:57Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-20479"
    },
    {
      "type": "WEB",
      "url": "https://www.mediatek.com/product-security-bulletin/August-2026"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "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-2026-20479 (GCVE-0-2026-20479)

FKIE_CVE-2026-20479

GHSA-6G35-P5GH-6QH4

Tags

Sightings

Nomenclature