CVE-2026-20519
Received Received - Intake

Out-of-Bounds Write in Modem Firmware

Publication date: 2026-10-05

Last updated on: 2026-10-05

Assigner: MediaTek, Inc.

Description
In Modem, there is a possible out of bounds write 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: MOLY01778993; Issue ID: MSV-8898.

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Meta Information

Published
2026-10-05
Last Modified
2026-10-05
Generated
2026-10-05
AI Q&A
2026-10-05
EPSS Evaluated
N/A
NVD
CVE-2026-20519
EUVD
EUVD-2026-92210

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mediatek dimensity *
mediatek helio *
mediatek kompanio *
mediatek genio *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.

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Executive Summary

This is an out-of-bounds write vulnerability in MediaTek's modem subcomponent caused by a missing bounds check. It could allow remote code execution or system compromise if a user device connects to a malicious base station controlled by an attacker. No user interaction or additional privileges are required for exploitation.

Detection Guidance

Detection requires checking if your device uses an affected MediaTek chipset and verifying if the latest security patches have been applied. Contact your device manufacturer for specific detection methods. MediaTek has provided patches to OEMs, so check for firmware updates from your device vendor.

Impact Analysis

If exploited, this vulnerability could allow an attacker to gain control over your device by tricking it into connecting to a rogue base station. This could lead to unauthorized access, data theft, or further malicious activities on your device without your knowledge.

Compliance Impact

This vulnerability could potentially lead to unauthorized access or control of affected devices, which may compromise sensitive user data. This could impact compliance with regulations like GDPR (data protection) or HIPAA (healthcare data) if exploited in devices handling such data. However, specific compliance impacts depend on device usage and data processed.

Mitigation Strategies

Immediately apply the latest security patches provided by your device manufacturer. If no patch is available, avoid connecting to untrusted networks or rogue base stations. Monitor MediaTek's security bulletins for updates and follow OEM guidance for affected devices.

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