# CVE-2026-20503

## Summary

- **CVE ID:** CVE-2026-20503
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-617
- **Published:** Sep 7, 2026
- **Last Modified:** Sep 7, 2026

## 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: MOLY01371002; Issue ID: MSV-9020.

## Affected Products

- MediaTek, Inc. — MediaTek chipset (MT2716)
- MediaTek, Inc. — MediaTek chipset (MT2735)
- MediaTek, Inc. — MediaTek chipset (MT2737)
- MediaTek, Inc. — MediaTek chipset (MT6813)
- MediaTek, Inc. — MediaTek chipset (MT6833)
- MediaTek, Inc. — MediaTek chipset (MT6835)
- MediaTek, Inc. — MediaTek chipset (MT6853)
- MediaTek, Inc. — MediaTek chipset (MT6855)
- MediaTek, Inc. — MediaTek chipset (MT6858)
- MediaTek, Inc. — MediaTek chipset (MT6873)
- MediaTek, Inc. — MediaTek chipset (MT6875)
- MediaTek, Inc. — MediaTek chipset (MT6877)
- MediaTek, Inc. — MediaTek chipset (MT6878)
- MediaTek, Inc. — MediaTek chipset (MT6879)
- MediaTek, Inc. — MediaTek chipset (MT6880)
- MediaTek, Inc. — MediaTek chipset (MT6881)
- MediaTek, Inc. — MediaTek chipset (MT6883)
- MediaTek, Inc. — MediaTek chipset (MT6885)
- MediaTek, Inc. — MediaTek chipset (MT6886)
- MediaTek, Inc. — MediaTek chipset (MT6889)
- MediaTek, Inc. — MediaTek chipset (MT6890)
- MediaTek, Inc. — MediaTek chipset (MT6891)
- MediaTek, Inc. — MediaTek chipset (MT6893)
- MediaTek, Inc. — MediaTek chipset (MT6895)
- MediaTek, Inc. — MediaTek chipset (MT6896)
- MediaTek, Inc. — MediaTek chipset (MT6897)
- MediaTek, Inc. — MediaTek chipset (MT6899)
- MediaTek, Inc. — MediaTek chipset (MT6980)
- MediaTek, Inc. — MediaTek chipset (MT6982VB)
- MediaTek, Inc. — MediaTek chipset (MT6983)
- MediaTek, Inc. — MediaTek chipset (MT6985)
- MediaTek, Inc. — MediaTek chipset (MT6986)
- MediaTek, Inc. — MediaTek chipset (MT6988)
- MediaTek, Inc. — MediaTek chipset (MT6989)
- MediaTek, Inc. — MediaTek chipset (MT6990)
- MediaTek, Inc. — MediaTek chipset (MT6991)
- MediaTek, Inc. — MediaTek chipset (MT6993)
- MediaTek, Inc. — MediaTek chipset (MT8668)
- MediaTek, Inc. — MediaTek chipset (MT8673)
- MediaTek, Inc. — MediaTek chipset (MT8675)
- MediaTek, Inc. — MediaTek chipset (MT8676)
- MediaTek, Inc. — MediaTek chipset (MT8678)
- MediaTek, Inc. — MediaTek chipset (MT8755)
- MediaTek, Inc. — MediaTek chipset (MT8771)
- MediaTek, Inc. — MediaTek chipset (MT8775)
- MediaTek, Inc. — MediaTek chipset (MT8791)
- MediaTek, Inc. — MediaTek chipset (MT8791T)
- MediaTek, Inc. — MediaTek chipset (MT8792)
- MediaTek, Inc. — MediaTek chipset (MT8793)
- MediaTek, Inc. — MediaTek chipset (MT8795T)
- MediaTek, Inc. — MediaTek chipset (MT8796)
- MediaTek, Inc. — MediaTek chipset (MT8797)
- MediaTek, Inc. — MediaTek chipset (MT8798)
- MediaTek, Inc. — MediaTek chipset (MT8863)
- MediaTek, Inc. — MediaTek chipset (MT8873)
- MediaTek, Inc. — MediaTek chipset (MT8883)
- MediaTek, Inc. — MediaTek chipset (MT8893)

## References

- [CNA](https://www.mediatek.com/product-security-bulletin/September-2026)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.19%
- **EPSS Percentile:** 8.8

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._