Input Validation Flaw in MediaTek Modem Could Lead to System Crash
CVE-2026-20402

7.5HIGH

Key Information:

Vendor

MediaTek
Status
Mt2735, Mt6833, Mt6853, Mt6855, Mt6873, Mt6875, Mt6877, Mt6880, Mt6883, Mt6885, Mt6889, Mt6890, Mt6891, Mt6893, Mt8675, Mt8771, Mt8791, Mt8791t, Mt8797
Vendor
CVE Published:
2 February 2026

What is CVE-2026-20402?

A flaw in MediaTek's modem presents a significant risk due to improper input validation, which can cause a system crash. This vulnerability allows attackers to execute remote denial of service attacks when a user equipment (UE) connects to a malicious base station. No user interaction is necessary for the exploit, making it particularly dangerous. A patch has been released to address this issue, and users are strongly advised to update their systems.

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Deploy the Patch

Affected Version(s)

MT2735, MT6833, MT6853, MT6855, MT6873, MT6875, MT6877, MT6880, MT6883, MT6885, MT6889, MT6890, MT6891, MT6893, MT8675, MT8771, MT8791, MT8791T, MT8797 Modem NR15

References

https://corp.mediatek.com/product-security-bulletin/Febru...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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