CVE-2026-20503

Received Received - Intake

System Crash Due to Missing Bounds Check in Modem

Publication date: 2026-09-07

Last updated on: 2026-09-09

Assigner: MediaTek, Inc.

Description

In Modem, there is a possible system crash 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: MOLY01371002; Issue ID: MSV-9020.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-07

Last Modified

2026-09-09

Generated

2026-09-27

AI Q&A

2026-09-07

EPSS Evaluated

2026-09-26

NVD

CVE-2026-20503

EUVD

EUVD-2026-72196

Affected Vendors & Products

Vendor	Product	Version / Range
mediatek	mt2716_firmware	*
mediatek	mt2735_firmware	*
mediatek	mt2737_firmware	*
mediatek	mt6813_firmware	*
mediatek	mt6833_firmware	*
mediatek	mt6835_firmware	*
mediatek	mt6853_firmware	*
mediatek	mt6855_firmware	*
mediatek	mt6858_firmware	*
mediatek	mt6873_firmware	*
mediatek	mt6875_firmware	*
mediatek	mt6877_firmware	*
mediatek	mt6878_firmware	*
mediatek	mt6879_firmware	*
mediatek	mt6880_firmware	*
mediatek	mt6881_firmware	*
mediatek	mt6883_firmware	*
mediatek	mt6885_firmware	*
mediatek	mt6886_firmware	*
mediatek	mt6889_firmware	*
mediatek	mt6890_firmware	*
mediatek	mt6891_firmware	*
mediatek	mt6893_firmware	*
mediatek	mt6895_firmware	*
mediatek	mt6896_firmware	*
mediatek	mt6897_firmware	*
mediatek	mt6899_firmware	*
mediatek	mt6980_firmware	*
mediatek	mt6982vb_firmware	*
mediatek	mt6983_firmware	*
mediatek	mt6985_firmware	*
mediatek	mt6986_firmware	*
mediatek	mt6988_firmware	*
mediatek	mt6989_firmware	*
mediatek	mt6990_firmware	*
mediatek	mt6991_firmware	*
mediatek	mt6993_firmware	*
mediatek	mt8668_firmware	*
mediatek	mt8673_firmware	*
mediatek	mt8675_firmware	*
mediatek	mt8676_firmware	*
mediatek	mt8678_firmware	*
mediatek	mt8755_firmware	*
mediatek	mt8771_firmware	*
mediatek	mt8775_firmware	*
mediatek	mt8791_firmware	*
mediatek	mt8791t_firmware	*
mediatek	mt8792_firmware	*
mediatek	mt8793_firmware	*
mediatek	mt8795t_firmware	*
mediatek	mt8796_firmware	*
mediatek	mt8797_firmware	*
mediatek	mt8798_firmware	*
mediatek	mt8863_firmware	*
mediatek	mt8873_firmware	*
mediatek	mt8883_firmware	*
mediatek	mt8893_firmware	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-617	The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.

Attack-Flow Graph

Executive Summary

This vulnerability in Modem is a missing bounds check that could cause a system crash. It may lead to remote denial of service if a user equipment connects to a malicious base station controlled by an attacker. No additional privileges or user interaction are required for exploitation.

Impact Analysis

If exploited, this vulnerability could crash your device, making it unavailable for use. This could disrupt communication services like calls or data, especially if your device connects to a compromised network.

Compliance Impact

This vulnerability could lead to remote denial of service, potentially disrupting system availability. While not directly impacting GDPR or HIPAA compliance, such disruptions may affect data processing integrity and availability requirements under these regulations.

Mitigation Strategies

Apply the provided patch ID MOLY01371002 to address the missing bounds check in the Modem component. Ensure your system is updated to the latest firmware version to prevent exploitation.

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