---
id: "CVE-2026-20552"
kind: "vulnerability"
aliases: ["CVE-2026-20552"]
title: "MediaTek modem driver: out-of-bounds write allows remote denial of service"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["android", "infrastructure", "iot", "mediatek", "modem"]
not_affected_if: ["other-chipset"]
published_at: "2026-11-02T03:17:32+00:00"
first_seen_at: "2026-11-02T03:31:24+00:00"
updated_at: "2026-11-02T03:33:55+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-20552", "first_seen_at": "2026-11-02T03:31:24+00:00"}]
---

# MediaTek modem driver: out-of-bounds write allows remote denial of service

A missing bounds check in the ccci modem driver in MediaTek chipsets allows an out-of-bounds write. The sources say this can lead to a remote denial of service without extra privileges, and user interaction is needed.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check whether the device uses a MediaTek modem chipset such as MT6880, MT6890, MT6813, MT6986, MT6982, MT6980D, MT2735 or MT2737.
- Check the device's security patch level against the vendor's bulletin for patch ALPS11523478, ALPS11297423 or AUTO00864897.

## Timeline

- 2026-11-02T03:31:24+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-20552

## From the sources

In ccci, there is a possible out of bounds write due to a missing bounds check. This could lead to remote denial of service with no additional execution privileges needed. User interaction is needed for exploitation. Patch ID: ALPS11523478 (Note: For MT6880, MT6890) / ALPS11297423 (Note: For MT6813, MT6986, MT6982, MT6980D) / AUTO00864897 (Note: For MT2735, MT2737); Issue ID: MSV-10724.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_