CVE-2026-20458

Modem firmware buffer overflow exploitable by rogue base station

Published Jul 1, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Description

In Modem, there is a possible memory corruption due to a missing bounds check. This could lead to remote escalation of privilege, 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: MOLY01402160; Issue ID: MSV-7298.

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
`MT2716`	affected	—
`MT2737`	affected	—
`MT6739`	affected	—
`MT6761`	affected	—
`MT6762`	affected	—
`MT6763`	affected	—
`MT6765`	affected	—
`MT6767`	affected	—
`MT6768`	affected	—
`MT6769`	affected	—
`MT6771`	affected	—
`MT6779`	affected	—
`MT6781`	affected	—
`MT6783`	affected	—
`MT6785`	affected	—
`MT6789`	affected	—
`MT6813`	affected	—
`MT6835`	affected	—
`MT6858`	affected	—
`MT6878`	affected	—
`MT6879`	affected	—
`MT6881`	affected	—
`MT6886`	affected	—
`MT6895`	affected	—
`MT6896`	affected	—
`MT6897`	affected	—
`MT6899`	affected	—
`MT6980`	affected	—
`MT6982`	affected	—
`MT6983`	affected	—
`MT6985`	affected	—
`MT6986`	affected	—
`MT6986D`	affected	—
`MT6988`	affected	—
`MT6989`	affected	—
`MT6990`	affected	—
`MT6991`	affected	—
`MT6993`	affected	—
`MT8666`	affected	—
`MT8667`	affected	—
`MT8668`	affected	—
`MT8673`	affected	—
`MT8676`	affected	—
`MT8678`	affected	—
`MT8755`	affected	—
`MT8765`	affected	—
`MT8766`	affected	—
`MT8766R`	affected	—
`MT8768`	affected	—
`MT8775`	affected	—
`MT8781`	affected	—
`MT8786`	affected	—
`MT8788`	affected	—
`MT8788E`	affected	—
`MT8789`	affected	—
`MT8792`	affected	—
`MT8793`	affected	—
`MT8795T`	affected	—
`MT8796`	affected	—
`MT8798`	affected	—
`MT8863`	affected	—
`MT8873`	affected	—
`MT8883`	affected	—
`MT8893`	affected	—

No data.

Vendor Product Versions

Mediatek, Inc.

Mediatek Chipset

Version	Status	Scheme	Platform
`MT2716`	affected	generic	—
`MT2737`	affected	generic	—
`MT6739`	affected	generic	—
`MT6761`	affected	generic	—
`MT6762`	affected	generic	—
`MT6763`	affected	generic	—
`MT6765`	affected	generic	—
`MT6767`	affected	generic	—
`MT6768`	affected	generic	—
`MT6769`	affected	generic	—
`MT6771`	affected	generic	—
`MT6779`	affected	generic	—
`MT6781`	affected	generic	—
`MT6783`	affected	generic	—
`MT6785`	affected	generic	—
`MT6789`	affected	generic	—
`MT6813`	affected	generic	—
`MT6835`	affected	generic	—
`MT6858`	affected	generic	—
`MT6878`	affected	generic	—
`MT6879`	affected	generic	—
`MT6881`	affected	generic	—
`MT6886`	affected	generic	—
`MT6895`	affected	generic	—
`MT6896`	affected	generic	—
`MT6897`	affected	generic	—
`MT6899`	affected	generic	—
`MT6980`	affected	generic	—
`MT6982`	affected	generic	—
`MT6983`	affected	generic	—
`MT6985`	affected	generic	—
`MT6986`	affected	generic	—
`MT6986D`	affected	generic	—
`MT6988`	affected	generic	—
`MT6989`	affected	generic	—
`MT6990`	affected	generic	—
`MT6991`	affected	generic	—
`MT6993`	affected	generic	—
`MT8666`	affected	generic	—
`MT8667`	affected	generic	—
`MT8668`	affected	generic	—
`MT8673`	affected	generic	—
`MT8676`	affected	generic	—
`MT8678`	affected	generic	—
`MT8755`	affected	generic	—
`MT8765`	affected	generic	—
`MT8766`	affected	generic	—
`MT8766R`	affected	generic	—
`MT8768`	affected	generic	—
`MT8775`	affected	generic	—
`MT8781`	affected	generic	—
`MT8786`	affected	generic	—
`MT8788`	affected	generic	—
`MT8788E`	affected	generic	—
`MT8789`	affected	generic	—
`MT8792`	affected	generic	—
`MT8793`	affected	generic	—
`MT8795T`	affected	generic	—
`MT8796`	affected	generic	—
`MT8798`	affected	generic	—
`MT8863`	affected	generic	—
`MT8873`	affected	generic	—
`MT8883`	affected	generic	—
`MT8893`	affected	generic	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Adjacent Network

Attack Complexity High

Privileges Required None

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% (0.329% 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 2, 2026 12:15 AM Title updated View changes

Type	Values Removed	Values Added
Title		Modem firmware buffer overflow exploitable by rogue base station

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

Type	Values Removed	Values Added
Title	Modem Firmware Vulnerability Allows Remote Privilege Escalation via Rogue Base Station

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

Type	Values Removed	Values Added
Title		Modem Firmware Vulnerability Allows Remote Privilege Escalation via Rogue Base Station

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

Type	Values Removed	Values Added
Title	Remote Privilege Escalation via Memory Corruption in MediaTek Modem Firmware

Jul 15, 2026 10:45 AM Title updated View changes

Type	Values Removed	Values Added
Title		Remote Privilege Escalation via Memory Corruption in MediaTek Modem Firmware

Jul 13, 2026 4:00 PM Title updated View changes

Type	Values Removed	Values Added
Title	Modem Firmware Memory Corruption Enables Remote Privilege Escalation

Jul 11, 2026 9:00 AM Title updated View changes

Type	Values Removed	Values Added
Title		Modem Firmware Memory Corruption Enables Remote Privilege Escalation

Jul 9, 2026 2:45 PM Title updated View changes

Type	Values Removed	Values Added
Title	Memory Corruption in MediaTek Modem Firmware Enables Remote Privilege Escalation

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

Type	Values Removed	Values Added
Title		Memory Corruption in MediaTek Modem Firmware Enables Remote Privilege Escalation

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

Type	Values Removed	Values Added
Title	Remote Privilege Escalation via Modem Memory Corruption on MediaTek Chipsets

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

Type	Values Removed	Values Added
Title		Remote Privilege Escalation via Modem Memory Corruption on MediaTek Chipsets

Jul 6, 2026 3:45 PM Title updated View changes

Type	Values Removed	Values Added
Title	Modem Firmware Missing Bounds Check Allows Remote Privilege Escalation

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

Type	Values Removed	Values Added
Title		Modem Firmware Missing Bounds Check Allows Remote Privilege Escalation

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

Type	Values Removed	Values Added
Title	Modem Firmware Buffer Overflow Enabling Remote Privilege Escalation

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

Type	Values Removed	Values Added
Title		Modem Firmware Buffer Overflow Enabling Remote Privilege Escalation

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

Type	Values Removed	Values Added
Title	Memory Corruption in MediaTek Modem Firmware Allows Remote Privilege Escalation

Jul 3, 2026 4:15 PM Title updated View changes

Type	Values Removed	Values Added
Title		Memory Corruption in MediaTek Modem Firmware Allows Remote Privilege Escalation

Jul 3, 2026 2:00 AM Title updated View changes

Type	Values Removed	Values Added
Title	Memory Corruption in MediaTek Modem Firmware Allows Remote Privilege Escalation

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

Type	Values Removed	Values Added
Title		Memory Corruption in MediaTek Modem Firmware Allows Remote Privilege Escalation

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

Type	Values Removed	Values Added
Title	Memory Corruption in MediaTek Modem Firmware Allows Remote Privilege Escalation

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

Type	Values Removed	Values Added
Title		Memory Corruption in MediaTek Modem Firmware Allows Remote Privilege Escalation

Jul 1, 2026 11:45 PM Title updated View changes

Type	Values Removed	Values Added
Title	MediaTek Modem Firmware Vulnerability Allows Remote Privilege Escalation via Rogue Base Station

Jul 1, 2026 7:00 PM Title updated View changes

Type	Values Removed	Values Added
Title		MediaTek Modem Firmware Vulnerability Allows Remote Privilege Escalation via Rogue Base Station

Jul 1, 2026 4:30 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': 7.5, 'vector': 'CVSS:3.1/AV:A/AC:H/PR:N/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 11:15 AM Title updated View changes

Type	Values Removed	Values Added
Title	Memory Corruption in Modem Leading to Remote Privilege Escalation

Jul 1, 2026 6:45 AM Title updated View changes

Type	Values Removed	Values Added
Title		Memory Corruption in Modem Leading to Remote Privilege Escalation

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

Type	Values Removed	Values Added
Description		In Modem, there is a possible memory corruption due to a missing bounds check. This could lead to remote escalation of privilege, 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: MOLY01402160; Issue ID: MSV-7298.
Weaknesses		CWE-787
References		https://corp.mediatek.com/product-security-bulletin/July-2026