CVE-2026-20527

Analyzed Analyzed - Analysis Complete

Modem System Crash via Missing Bounds Check Leads to DoS

Publication date: 2026-10-05

Last updated on: 2026-10-08

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: MOLY01864925 / MOLY01210562; Issue ID: MSV-8303.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-05

Last Modified

2026-10-08

Generated

2026-10-19

AI Q&A

2026-10-05

EPSS Evaluated

2026-10-18

NVD

CVE-2026-20527

EUVD

EUVD-2026-92200

Affected Vendors & Products

Vendor	Product	Version / Range
mediatek	mt2716_firmware	*
mediatek	mt2735_firmware	*
mediatek	mt2737_firmware	*
mediatek	mt6813_firmware	*
mediatek	mt6815_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	mt6982_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	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	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-129	The product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array.

Attack-Flow Graph

Executive Summary

This vulnerability in the Mediatek modem allows a remote attacker to crash the system by exploiting a missing bounds check. This can lead to a denial of service if a user equipment connects to a malicious base station controlled by the attacker. No special privileges or user interaction are required for exploitation.

Detection Guidance

Detection requires checking for MediaTek modem firmware versions and applying vendor patches. Use device management tools or OEM-specific commands to verify modem firmware versions and compare against patched releases. Monitor for system crashes or unexpected modem behavior.

Impact Analysis

If your device uses a Mediatek modem and connects to a rogue base station, this vulnerability could cause your device to crash, leading to a denial of service. This means your device may become unresponsive or require a reboot.

Compliance Impact

This vulnerability could lead to remote denial of service, potentially disrupting services that handle sensitive data. While not directly violating GDPR or HIPAA, such disruptions may impact compliance by affecting availability of systems processing personal or health data.

Mitigation Strategies

Apply the provided patch IDs MOLY01864925 or MOLY01210562 to address the missing bounds check in the Modem component.

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