---
id: "CVE-2025-66366"
kind: "vulnerability"
aliases: ["CVE-2025-66366"]
title: "Baseband crash from malformed unauthenticated downlink RRC Setup message"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["baseband", "cellular-modem", "other"]
not_affected_if: []
published_at: "2026-11-05T03:17:17+00:00"
first_seen_at: "2026-11-05T03:31:40+00:00"
updated_at: "2026-11-05T03:33:55+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66366", "first_seen_at": "2026-11-05T03:31:40+00:00"}]
exploit_sources: []
---

# Baseband crash from malformed unauthenticated downlink RRC Setup message

The baseband handles unauthenticated downlink RRC Setup messages incorrectly, so a crafted message from a cellular network can crash it. The sources describe only a crash; no code execution or data access is stated.

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

## Timeline

- 2026-11-05T03:31:40+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2025-66366

## From the sources

Incorrect handling of unauthenticated downlink RRC Setup messages can cause the baseband to crash

---

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