---
id: "CVE-2026-20563"
kind: "vulnerability"
aliases: ["CVE-2026-20563"]
title: "Modem: out-of-bounds write lets a rogue base station crash the phone"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["android", "cellular", "infrastructure", "mobile-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: "2026-11-02T03:32:30+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-20563", "first_seen_at": "2026-11-02T03:31:25+00:00"}]
---

# Modem: out-of-bounds write lets a rogue base station crash the phone

A bounds-check error in the modem firmware allows an out-of-bounds write. A phone (UE) that connects to an attacker-controlled rogue base station can be remotely denied service.

_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-2026-20563

## From the sources

In Modem, there is a possible out of bounds write due to an incorrect 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: MOLY01777997; Issue ID: MSV-8905.

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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_