Denial of Service Vulnerability in Mediatek Modem
CVE-2026-20421

7.5HIGH

Key Information:

Vendor

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

What is CVE-2026-20421?

A vulnerability in Mediatek's modem due to improper input validation can lead to a potential system crash. This security flaw allows an attacker to exploit a rogue base station, resulting in remote denial of service without requiring user interaction or additional execution privileges. Addressing this issue is crucial to maintaining device stability and protecting users from possible service disruptions. Affected users are encouraged to apply the available patches to ensure the security of 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, MT8791 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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