---
id: "CVE-2026-20546"
kind: "vulnerability"
aliases: ["CVE-2026-20546"]
title: "Modem firmware: out-of-bounds write lets a rogue base station take over"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["cellular", "infrastructure", "mobile-devices", "modem"]
not_affected_if: ["no-cellular-modem"]
published_at: "2026-11-02T03:17:31+00:00"
first_seen_at: "2026-11-02T03:31:24+00:00"
updated_at: "2026-11-02T03:33:58+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-20546", "first_seen_at": "2026-11-02T03:31:24+00:00"}]
---

# Modem firmware: out-of-bounds write lets a rogue base station take over

A bounds-check flaw in the modem firmware allows an out-of-bounds write that can escalate privileges remotely. An attacker running a rogue base station can trigger it when a phone or device connects to it, with no user interaction needed.

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

## Timeline

- 2026-11-02T03:31:24+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-20546

## From the sources

In Modem, there is a possible out of bounds write due to an incorrect bounds check. This could lead to remote escalation of privilege, 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: MOLY01876654 / MOLY01774038; Issue ID: MSV-9803.

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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_