What is CVE-2026-20433?

CVE-2026-20433 is a high-severity vulnerability in Mediatek Mt2735, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2026-04-07.

How severe is CVE-2026-20433?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Mediatek Mt2735

CVE-2026-20433

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 priv…

Vulnerability class: Buffer Overflow

EPSS: 0.003 (26.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mediatek Mt2735
Mediatek Mt2735_firmware
Mediatek Mt2737
Mediatek Mt2737_firmware
Mediatek Mt6813
Mediatek Mt6813_firmware
Mediatek Mt6833
Mediatek Mt6833_firmware
Mediatek Mt6833p
Mediatek Mt6833p_firmware

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

security@mediatek.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-20433?: CVE-2026-20433 is a high-severity vulnerability in Mediatek Mt2735, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2026-04-07.
How severe is CVE-2026-20433?: High severity. CVSS v3 base score is 8.8 out of 10.