CVE-2026-20545
Received Received - Intake

Out of Bounds Write in Modem

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: MOLY01879158 / MOLY01774038; Issue ID: MSV-9811.

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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
CVE-2026-20545

Affected Vendors & Products

Showing 77 associated CPEs
Vendor Product Version / Range
MediaTek, Inc. MediaTek chipset MT2716
MediaTek, Inc. MediaTek chipset MT2735
MediaTek, Inc. MediaTek chipset MT2737
MediaTek, Inc. MediaTek chipset MT6739
MediaTek, Inc. MediaTek chipset MT6761
MediaTek, Inc. MediaTek chipset MT6762
MediaTek, Inc. MediaTek chipset MT6763
MediaTek, Inc. MediaTek chipset MT6765
MediaTek, Inc. MediaTek chipset MT6767
MediaTek, Inc. MediaTek chipset MT6768
MediaTek, Inc. MediaTek chipset MT6769
MediaTek, Inc. MediaTek chipset MT6771
MediaTek, Inc. MediaTek chipset MT6779
MediaTek, Inc. MediaTek chipset MT6781
MediaTek, Inc. MediaTek chipset MT6783
MediaTek, Inc. MediaTek chipset MT6785
MediaTek, Inc. MediaTek chipset MT6789
MediaTek, Inc. MediaTek chipset MT6813
MediaTek, Inc. MediaTek chipset MT6815
MediaTek, Inc. MediaTek chipset MT6833
MediaTek, Inc. MediaTek chipset MT6835
MediaTek, Inc. MediaTek chipset MT6853
MediaTek, Inc. MediaTek chipset MT6855
MediaTek, Inc. MediaTek chipset MT6858
MediaTek, Inc. MediaTek chipset MT6873
MediaTek, Inc. MediaTek chipset MT6875
MediaTek, Inc. MediaTek chipset MT6877
MediaTek, Inc. MediaTek chipset MT6878
MediaTek, Inc. MediaTek chipset MT6879
MediaTek, Inc. MediaTek chipset MT6880
MediaTek, Inc. MediaTek chipset MT6881
MediaTek, Inc. MediaTek chipset MT6883
MediaTek, Inc. MediaTek chipset MT6885
MediaTek, Inc. MediaTek chipset MT6886
MediaTek, Inc. MediaTek chipset MT6889
MediaTek, Inc. MediaTek chipset MT6890
MediaTek, Inc. MediaTek chipset MT6891
MediaTek, Inc. MediaTek chipset MT6893
MediaTek, Inc. MediaTek chipset MT6895
MediaTek, Inc. MediaTek chipset MT6896
MediaTek, Inc. MediaTek chipset MT6897
MediaTek, Inc. MediaTek chipset MT6899
MediaTek, Inc. MediaTek chipset MT6980
MediaTek, Inc. MediaTek chipset MT6982
MediaTek, Inc. MediaTek chipset MT6983
MediaTek, Inc. MediaTek chipset MT6985
MediaTek, Inc. MediaTek chipset MT6986
MediaTek, Inc. MediaTek chipset MT6988
MediaTek, Inc. MediaTek chipset MT6989
MediaTek, Inc. MediaTek chipset MT6990
MediaTek, Inc. MediaTek chipset MT6991
MediaTek, Inc. MediaTek chipset MT6993
MediaTek, Inc. MediaTek chipset MT8668
MediaTek, Inc. MediaTek chipset MT8676
MediaTek, Inc. MediaTek chipset MT8678
MediaTek, Inc. MediaTek chipset MT8755
MediaTek, Inc. MediaTek chipset MT8765
MediaTek, Inc. MediaTek chipset MT8766
MediaTek, Inc. MediaTek chipset MT8766R
MediaTek, Inc. MediaTek chipset MT8768
MediaTek, Inc. MediaTek chipset MT8771
MediaTek, Inc. MediaTek chipset MT8775
MediaTek, Inc. MediaTek chipset MT8781
MediaTek, Inc. MediaTek chipset MT8786
MediaTek, Inc. MediaTek chipset MT8788E
MediaTek, Inc. MediaTek chipset MT8791
MediaTek, Inc. MediaTek chipset MT8791T
MediaTek, Inc. MediaTek chipset MT8792
MediaTek, Inc. MediaTek chipset MT8793
MediaTek, Inc. MediaTek chipset MT8796
MediaTek, Inc. MediaTek chipset MT8797
MediaTek, Inc. MediaTek chipset MT8798
MediaTek, Inc. MediaTek chipset MT8863
MediaTek, Inc. MediaTek chipset MT8873
MediaTek, Inc. MediaTek chipset MT8875
MediaTek, Inc. MediaTek chipset MT8883
MediaTek, Inc. MediaTek chipset MT8893

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

CVE-2026-20545 is a critical vulnerability in MediaTek chipsets' modem subcomponent. It involves a missing bounds check that could allow an out-of-bounds write, leading to memory corruption or unintended behavior. Exploitation could enable remote privilege escalation if a user device connects to a malicious base station controlled by an attacker.

Detection Guidance

Detection requires checking if your device uses an affected MediaTek chipset. Review device specifications or firmware details to identify if your system includes any of the vulnerable models listed in the MediaTek security bulletin. No specific commands are provided in the context for direct detection.

Impact Analysis

This vulnerability could allow an attacker to gain elevated privileges on your device if it connects to a rogue base station. No user interaction is required for exploitation, meaning it could happen silently in the background. The impact includes potential unauthorized access to device functions or data.

Compliance Impact

The vulnerability could lead to remote escalation of privilege, potentially allowing unauthorized access to sensitive data. This may impact compliance with GDPR (data protection) and HIPAA (health data security) by increasing the risk of data breaches or unauthorized access to personal or health information.

Mitigation Strategies

Apply the security patches provided by MediaTek or your device OEM. Since patches were released at least two months before public disclosure, check for updates through your device manufacturer's official channels. Ensure all connected devices are updated to prevent potential exploitation.

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