CVE-2026-20403 — MEDIUM (6.5)

Vulnerability Description

In Modem, there is a possible system crash due to a missing bounds check. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01689254 (Note: For N15 and NR16) / MOLY01689259 (Note: For NR17 and NR17R); Issue ID: MSV-4843.

CVSS Score

6.5

MEDIUM

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

ADJACENT_NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Mediatek	Nr15	-
Mediatek	Nr16	-
Mediatek	Nr17	-
Mediatek	Nr17R	-
Mediatek	Mt2735	-
Mediatek	Mt2737	-
Mediatek	Mt6813	-
Mediatek	Mt6815	-
Mediatek	Mt6833	-
Mediatek	Mt6835	-
Mediatek	Mt6853	-
Mediatek	Mt6855	-
Mediatek	Mt6873	-
Mediatek	Mt6875	-
Mediatek	Mt6877	-
Mediatek	Mt6878	-
Mediatek	Mt6879	-
Mediatek	Mt6880	-
Mediatek	Mt6883	-
Mediatek	Mt6885	-

Related Weaknesses (CWE)

CWE-787

References

https://corp.mediatek.com/product-security-bulletin/February-2026Vendor Advisory

FAQ

What is CVE-2026-20403?

CVE-2026-20403 is a vulnerability with a CVSS score of 6.5 (MEDIUM). In Modem, there is a possible system crash due to a missing bounds check. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no...

How severe is CVE-2026-20403?

CVE-2026-20403 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-20403?

Check the references section above for vendor advisories and patch information. Affected products include: Mediatek Nr15, Mediatek Nr16, Mediatek Nr17, Mediatek Nr17R, Mediatek Mt2735.