#VU125018 Out-of-bounds write in MediaTek products - CVE-2026-20433
Published: April 7, 2026
Vulnerability identifier: #VU125018
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-20433
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
MT2735
MT2737
MT6813
MT6833
MT6833P
MT6835
MT6835T
MT6855
MT6855T
MT6875T
MT6877T
MT6877TT
MT6878
MT6878M
MT6879
MT6880
MT6886
MT6890
MT6895
MT6895TT
MT6896
MT6897
MT6899
MT6980
MT6980D
MT6983
MT6983T
MT6985
MT6985T
MT6989
MT6989T
MT6990
MT6991
MT8668
MT8673
MT8675
MT8676
MT8678
MT8755
MT8771
MT8775
MT8791
MT8791T
MT8792
MT8793
MT8795T
MT8798
MT8863
MT8873
MT8883
MT8893
MT6853
MT6853T
MT6873
MT6875
MT6877
MT6883
MT6885
MT6889
MT6891
MT6893
MT8797
MT2735
MT2737
MT6813
MT6833
MT6833P
MT6835
MT6835T
MT6855
MT6855T
MT6875T
MT6877T
MT6877TT
MT6878
MT6878M
MT6879
MT6880
MT6886
MT6890
MT6895
MT6895TT
MT6896
MT6897
MT6899
MT6980
MT6980D
MT6983
MT6983T
MT6985
MT6985T
MT6989
MT6989T
MT6990
MT6991
MT8668
MT8673
MT8675
MT8676
MT8678
MT8755
MT8771
MT8775
MT8791
MT8791T
MT8792
MT8793
MT8795T
MT8798
MT8863
MT8873
MT8883
MT8893
MT6853
MT6853T
MT6873
MT6875
MT6877
MT6883
MT6885
MT6889
MT6891
MT6893
MT8797
Software vendor:
MediaTek
MediaTek
Description
The vulnerability allows a local user to cause memory corruption.
The vulnerability exists due to out-of-bounds write in modem when handling input. A local user can send crafted input to cause memory corruption.
Remediation
Install security update from vendor's website.