CVE-2026-20433

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-07 · updated 2026-06-17
Weakness: CWE-787

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 needed for exploitation. Patch ID: MOLY01088681; Issue ID: MSV-4460.

Affected products

Mediatek Mt2735 Firmware: all versions
Mediatek Mt2737 Firmware: all versions
Mediatek Mt6813 Firmware: all versions
Mediatek Mt6833 Firmware: all versions
Mediatek Mt6833P Firmware: all versions
Mediatek Mt6835 Firmware: all versions
Mediatek Mt6835T Firmware: all versions
Mediatek Mt6853 Firmware: all versions
Mediatek Mt6853T Firmware: all versions
Mediatek Mt6855 Firmware: all versions
Mediatek Mt6855T Firmware: all versions
Mediatek Mt6873 Firmware: all versions
Mediatek Mt6875 Firmware: all versions
Mediatek Mt6875T Firmware: all versions
Mediatek Mt6877 Firmware: all versions
Mediatek Mt6877T Firmware: all versions
Mediatek Mt6877Tt Firmware: all versions
Mediatek Mt6878 Firmware: all versions
Mediatek Mt6878M Firmware: all versions
Mediatek Mt6879 Firmware: all versions
Mediatek Mt6880 Firmware: all versions
Mediatek Mt6883 Firmware: all versions
Mediatek Mt6885 Firmware: all versions
Mediatek Mt6886 Firmware: all versions
Mediatek Mt6889 Firmware: all versions
Mediatek Mt6890 Firmware: all versions
Mediatek Mt6891 Firmware: all versions
Mediatek Mt6893 Firmware: all versions
Mediatek Mt6895 Firmware: all versions
Mediatek Mt6895Tt Firmware: all versions

References

https://corp.mediatek.com/product-security-bulletin/April-2026

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