Heap-based buffer overflow in MediaTek products - CVE-2026-20449
Published: May 4, 2026
Vulnerability identifier: #VU129561
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-20449
CWE-ID: CWE-122
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
MT2735
MT2737
MT6739
MT6761
MT6762
MT6763
MT6765
MT6767
MT6768
MT6769
MT6771
MT6783
MT6789
MT6813
MT6815
MT6833
MT6835
MT6855
MT6858
MT6878
MT6879
MT6880
MT6886
MT6890
MT6895
MT6896
MT6897
MT6899
MT6980
MT6983
MT6985
MT6986D
MT6988
MT6989
MT6990
MT6991
MT6993
MT8668
MT8673
MT8675
MT8676
MT8678
MT8755
MT8771
MT8775
MT8791
MT8791T
MT8792
MT8793
MT8795T
MT8798
MT8863
MT8873
MT8883
MT8893
MT6779
MT6781
MT6785
MT6853
MT6873
MT6875
MT6877
MT6883
MT6885
MT6889
MT6891
MT6893
MT8797
MT2735
MT2737
MT6739
MT6761
MT6762
MT6763
MT6765
MT6767
MT6768
MT6769
MT6771
MT6783
MT6789
MT6813
MT6815
MT6833
MT6835
MT6855
MT6858
MT6878
MT6879
MT6880
MT6886
MT6890
MT6895
MT6896
MT6897
MT6899
MT6980
MT6983
MT6985
MT6986D
MT6988
MT6989
MT6990
MT6991
MT6993
MT8668
MT8673
MT8675
MT8676
MT8678
MT8755
MT8771
MT8775
MT8791
MT8791T
MT8792
MT8793
MT8795T
MT8798
MT8863
MT8873
MT8883
MT8893
MT6779
MT6781
MT6785
MT6853
MT6873
MT6875
MT6877
MT6883
MT6885
MT6889
MT6891
MT6893
MT8797
Software vendor:
MediaTek
MediaTek
Description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to heap-based buffer overflow in modem when processing crafted local input. A local user can trigger the vulnerable condition to cause a denial of service.
Remediation
Install security update from vendor's website.