CVE-2026-20557
Received Received - Intake

Out of Bounds Write in Modem

Vulnerability report for CVE-2026-20557, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-11-02

Last updated on: 2026-11-02

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: MOLY01877236; Issue ID: MSV-9804.

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Meta Information

Published
2026-11-02
Last Modified
2026-11-02
Generated
2026-11-02
AI Q&A
2026-11-02
EPSS Evaluated
N/A
NVD

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 vulnerability is a missing bounds check in Modem that allows an out of bounds write. It can lead to remote privilege escalation if a user equipment connects to a malicious base station controlled by an attacker. No user interaction or additional privileges are required for exploitation.

Impact Analysis

An attacker could exploit this to gain elevated privileges on your device remotely. This could allow them to take control of your device if it connects to a compromised network or rogue base station.

Compliance Impact

The provided CVE data does not specify direct impacts on compliance with GDPR, HIPAA, or other standards. The vulnerability involves a potential out-of-bounds write in MediaTek chipsets, enabling remote privilege escalation via rogue base stations. Without explicit details on data exposure or privacy implications, its compliance impact remains unclear.

Mitigation Strategies

Apply the patch identified as MOLY01877236 from MediaTek to address the missing bounds check in the Modem component.

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