CVE-2026-20499
Received Received - Intake

Out-of-Bounds Write in Modem Firmware

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: MOLY01857954; Issue ID: MSV-8247.

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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-2026-20499

Affected Vendors & Products

Showing 82 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 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 MT6982VB
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 MT8666
MediaTek, Inc. MediaTek chipset MT8667
MediaTek, Inc. MediaTek chipset MT8668
MediaTek, Inc. MediaTek chipset MT8673
MediaTek, Inc. MediaTek chipset MT8675
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 MT8788
MediaTek, Inc. MediaTek chipset MT8788E
MediaTek, Inc. MediaTek chipset MT8789
MediaTek, Inc. MediaTek chipset MT8791
MediaTek, Inc. MediaTek chipset MT8791T
MediaTek, Inc. MediaTek chipset MT8792
MediaTek, Inc. MediaTek chipset MT8793
MediaTek, Inc. MediaTek chipset MT8795T
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 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

This vulnerability is a missing bounds check in Modem that allows an out of bounds write. It can lead to remote escalation of privilege if a user equipment (UE) connects to a rogue 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 by tricking it into connecting to a malicious base station. This could allow unauthorized access or control over your device's modem functions.

Compliance Impact

The provided CVE data does not specify direct impacts on compliance with GDPR, HIPAA, or other standards. The vulnerability involves a possible out of bounds write in Modem leading to remote privilege escalation via a rogue base station, but no details are given about data exposure or regulatory implications.

Mitigation Strategies

Apply the patch ID MOLY01857954 provided by MediaTek to address the missing bounds check in Modem. Ensure all MediaTek chipsets are updated to the latest firmware version to prevent remote escalation of privilege via rogue base stations.

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