---
id: "CVE-2026-20564"
kind: "vulnerability"
aliases: ["CVE-2026-20564"]
title: "Modem: out-of-bounds write from a bad bounds check crashes the device"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "mobile-device", "modem"]
not_affected_if: []
published_at: "2026-11-02T03:17:33+00:00"
first_seen_at: "2026-11-02T03:31:25+00:00"
updated_at: "2026-11-02T03:32:28+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-20564", "first_seen_at": "2026-11-02T03:31:25+00:00"}]
---

# Modem: out-of-bounds write from a bad bounds check crashes the device

A bounds check in the modem firmware is incorrect, allowing an out-of-bounds write. Per the description, an attacker on the device can cause a local denial of service without extra privileges or user interaction.

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

## Timeline

- 2026-11-02T03:31:25+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-20564

## From the sources

In Modem, there is a possible out of bounds write due to an incorrect bounds check. This could lead to local denial of service with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01780439; Issue ID: MSV-8901.

---

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