CVE-2026-20462

Heap Buffer Overflow in MediaTek Telephony Enables Local Privilege Escalation

Published Jul 1, 2026 CVSS 3.1 · 6.7 Medium EPSS < 1% KEV · Not listed

Description

In Telephony, there is a possible memory corruption due to a heap buffer overflow. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS11006447; Issue ID: MSV-7871.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

MediaTek, Inc.

MediaTek chipset

unaffected

Version	Status	Constraints
`MT6739`	affected	—
`MT6761`	affected	—
`MT6765`	affected	—
`MT6768`	affected	—
`MT6781`	affected	—
`MT6789`	affected	—
`MT6833`	affected	—
`MT6853`	affected	—
`MT6855`	affected	—
`MT6877`	affected	—
`MT6883`	affected	—
`MT6885`	affected	—
`MT6889`	affected	—
`MT6893`	affected	—
`MT8695`	affected	—
`MT8696`	affected	—
`MT8765`	affected	—
`MT8766`	affected	—
`MT8766R`	affected	—
`MT8768`	affected	—
`MT8781`	affected	—
`MT8791`	affected	—

No data.

Vendor Product Versions

Mediatek, Inc.

Mediatek Chipset

Version	Status	Scheme	Platform
`MT6739`	affected	generic	—
`MT6761`	affected	generic	—
`MT6765`	affected	generic	—
`MT6768`	affected	generic	—
`MT6781`	affected	generic	—
`MT6789`	affected	generic	—
`MT6833`	affected	generic	—
`MT6853`	affected	generic	—
`MT6855`	affected	generic	—
`MT6877`	affected	generic	—
`MT6883`	affected	generic	—
`MT6885`	affected	generic	—
`MT6889`	affected	generic	—
`MT6893`	affected	generic	—
`MT8695`	affected	generic	—
`MT8696`	affected	generic	—
`MT8765`	affected	generic	—
`MT8766`	affected	generic	—
`MT8766R`	affected	generic	—
`MT8768`	affected	generic	—
`MT8781`	affected	generic	—
`MT8791`	affected	generic	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.159% probability within 30 days)

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://corp.mediatek.com/product-security-bulletin/July-2026

History

Aug 3, 2026 6:30 AM Title updated View changes

Type	Values Removed	Values Added
Title		Heap Buffer Overflow in MediaTek Telephony Enables Local Privilege Escalation

Jul 28, 2026 4:15 PM Title updated View changes

Type	Values Removed	Values Added
Title	MediaTek Telephony Heap Buffer Overflow Leading to Local Privilege Escalation

Jul 24, 2026 6:30 PM Title updated View changes

Type	Values Removed	Values Added
Title		MediaTek Telephony Heap Buffer Overflow Leading to Local Privilege Escalation

Jul 21, 2026 3:30 PM Title updated View changes

Type	Values Removed	Values Added
Title	Heap Buffer Overflow in MediaTek Telephony Component Enables Local Privilege Escalation

Jul 15, 2026 11:15 PM Title updated View changes

Type	Values Removed	Values Added
Title		Heap Buffer Overflow in MediaTek Telephony Component Enables Local Privilege Escalation

Jul 14, 2026 11:30 AM Title updated View changes

Type	Values Removed	Values Added
Title	Heap Buffer Overflow in MediaTek Telephony Leading to Local Privilege Escalation

Jul 13, 2026 4:45 AM Title updated View changes

Type	Values Removed	Values Added
Title		Heap Buffer Overflow in MediaTek Telephony Leading to Local Privilege Escalation

Jul 12, 2026 2:15 AM Title updated View changes

Type	Values Removed	Values Added
Title	MediaTek Telephony Heap Overflow Enabling Local Privilege Escalation

Jul 10, 2026 5:30 PM Title updated View changes

Type	Values Removed	Values Added
Title		MediaTek Telephony Heap Overflow Enabling Local Privilege Escalation

Jul 10, 2026 3:45 AM Title updated View changes

Type	Values Removed	Values Added
Title	MediaTek Telephony Heap Overflow Enables Local Privilege Escalation

Jul 9, 2026 7:15 AM Title updated View changes

Type	Values Removed	Values Added
Title		MediaTek Telephony Heap Overflow Enables Local Privilege Escalation

Jul 8, 2026 2:15 PM Title updated View changes

Type	Values Removed	Values Added
Title	Heap Buffer Overflow in Telephony Component Enables Local Privilege Escalation

Jul 7, 2026 9:45 AM Title updated View changes

Type	Values Removed	Values Added
Title		Heap Buffer Overflow in Telephony Component Enables Local Privilege Escalation

Jul 6, 2026 12:00 PM Title updated View changes

Type	Values Removed	Values Added
Title	Memory Corruption in MediaTek Telephony Leading to Local Privilege Escalation

Jul 5, 2026 10:30 PM Title updated View changes

Type	Values Removed	Values Added
Title		Memory Corruption in MediaTek Telephony Leading to Local Privilege Escalation

Jul 5, 2026 11:15 AM Title updated View changes

Type	Values Removed	Values Added
Title	Heap Buffer Overflow in MediaTek Telephony Subsystem Enables Local Privilege Escalation

Jul 4, 2026 7:30 PM Title updated View changes

Type	Values Removed	Values Added
Title		Heap Buffer Overflow in MediaTek Telephony Subsystem Enables Local Privilege Escalation

Jul 4, 2026 7:15 AM Title updated View changes

Type	Values Removed	Values Added
Title	Heap Buffer Overflow in Telephony Enables Local Privilege Escalation

Jul 3, 2026 7:30 PM Title updated View changes

Type	Values Removed	Values Added
Title		Heap Buffer Overflow in Telephony Enables Local Privilege Escalation

Jul 3, 2026 8:30 AM Title updated View changes

Type	Values Removed	Values Added
Title	Memory Corruption in Telephony Enables Local Privilege Escalation

Jul 2, 2026 7:30 PM Title updated View changes

Type	Values Removed	Values Added
Title		Memory Corruption in Telephony Enables Local Privilege Escalation

Jul 2, 2026 2:00 PM Title updated View changes

Type	Values Removed	Values Added
Title	Heap Buffer Overflow in MediaTek Telephony Enables Local Privilege Escalation

Jul 2, 2026 8:30 AM Title updated View changes

Type	Values Removed	Values Added
Title		Heap Buffer Overflow in MediaTek Telephony Enables Local Privilege Escalation

Jul 2, 2026 1:45 AM Title updated View changes

Type	Values Removed	Values Added
Title	MediaTek Telephony Heap Buffer Overflow Leading to Local Privilege Escalation

Jul 1, 2026 10:00 PM Title updated View changes

Type	Values Removed	Values Added
Title		MediaTek Telephony Heap Buffer Overflow Leading to Local Privilege Escalation

Jul 1, 2026 5:30 PM Title updated View changes

Type	Values Removed	Values Added
Title	Heap Buffer Overflow in MediaTek Telephony Subsystem Enables Local Privilege Escalation

Jul 1, 2026 1:45 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Mediatek, Inc. Mediatek, Inc. mediatek Chipset
Vendors & Products		Mediatek, Inc. Mediatek, Inc. mediatek Chipset

Jul 1, 2026 11:30 AM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 6.7, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}` ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Jul 1, 2026 9:15 AM Title updated View changes

Type	Values Removed	Values Added
Title		Heap Buffer Overflow in MediaTek Telephony Subsystem Enables Local Privilege Escalation

Jul 1, 2026 3:30 AM Description updated. Weaknesses updated. Added references View changes

Type	Values Removed	Values Added
Description		In Telephony, there is a possible memory corruption due to a heap buffer overflow. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS11006447; Issue ID: MSV-7871.
Weaknesses		CWE-122
References		https://corp.mediatek.com/product-security-bulletin/July-2026