What is CVE-2026-20503?

CVE-2026-20503 is a medium-severity vulnerability in Mediatek, Inc. Mediatek Chipset, classified under Reachable Assertion. CVSS score: 5.3/10. Published 2026-09-07.

How severe is CVE-2026-20503?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Mediatek, Inc. Mediatek Chipset

CVE-2026-20503

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: MOLY01371002; Issue ID: MSV-9020.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Mediatek, Inc. Mediatek Chipset — versions MT2716, MT2735, MT2737

Weakness classification (CWE)

CWE-617 — Reachable Assertion

References

security@mediatek.com

Frequently asked questions

What is CVE-2026-20503?: CVE-2026-20503 is a medium-severity vulnerability in Mediatek, Inc. Mediatek Chipset, classified under Reachable Assertion. CVSS score: 5.3/10. Published 2026-09-07.
How severe is CVE-2026-20503?: Medium severity. CVSS v3 base score is 5.3 out of 10.