CVE-2026-20461
Received Received - Intake

Out of Bounds Write in Modem

Vulnerability report for CVE-2026-20461, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-07-01

Last updated on: 2026-07-01

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 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: MOLY01267281 / MOLY01318201; Issue ID: MSV-6486.

CVSS Scores

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Meta Information

Published
2026-07-01
Last Modified
2026-07-01
Generated
2026-07-01
AI Q&A
2026-07-01
EPSS Evaluated
N/A
NVD
EUVD

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
mediatek modem *

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.

Attack-Flow Graph

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Mitigation Strategies

To mitigate this vulnerability, apply the patches identified as MOLY01267281 or MOLY01318201 provided by the vendor.

Since the vulnerability involves a missing bounds check in the modem that can be exploited remotely without user interaction, updating the modem firmware to the patched version is the recommended immediate step.

Executive Summary

This vulnerability exists in the modem component where a missing bounds check can cause an out of bounds write.

An attacker controlling a rogue base station can exploit this flaw to cause a remote denial of service on a user equipment (UE) device connected to that base station.

No user interaction or additional execution privileges are required for exploitation.

Impact Analysis

The primary impact of this vulnerability is a remote denial of service condition on affected devices.

If a UE connects to a malicious base station controlled by an attacker, the attacker can trigger the vulnerability to disrupt the device's normal operation.

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