MediaTek Modem R-DoS via Bounds Check in Modem Firmware
CVE-2026-20504 Published on September 7, 2026
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: MOLY00755024; Issue ID: MSV-7865.
Vulnerability Analysis
Weakness Type
What is an assertion failure Vulnerability?
The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.
CVE-2026-20504 has been classified to as an assertion failure vulnerability or weakness.
Products Associated with CVE-2026-20504
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Affected Versions
MediaTek, Inc. MediaTek chipset:- Version MT2735 is affected.
- Version MT6833 is affected.
- Version MT6853 is affected.
- Version MT6855 is affected.
- Version MT6873 is affected.
- Version MT6875 is affected.
- Version MT6877 is affected.
- Version MT6880 is affected.
- Version MT6883 is affected.
- Version MT6885 is affected.
- Version MT6889 is affected.
- Version MT6890 is affected.
- Version MT6891 is affected.
- Version MT6893 is affected.
- Version MT8675 is affected.
- Version MT8771 is affected.
- Version MT8791 is affected.
- Version MT8791T is affected.
- Version MT8797 is affected.