---
id: "CVE-2026-102693"
kind: "vulnerability"
aliases: ["CVE-2026-102693"]
title: "RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded\u2026"
severity: "critical"
cvss: 9.6
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["atwinc15x0", "embedded", "infrastructure", "iot", "riot"]
not_affected_if: ["default-config", "no-atwinc15x0-driver", "version-2026.04-or-later"]
published_at: "2026-10-16T17:17:17+00:00"
first_seen_at: "2026-10-23T21:57:13+00:00"
updated_at: "2026-10-23T22:28:55+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-102693", "first_seen_at": "2026-10-23T21:57:13+00:00"}]
---

# RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded…

RIOT, an open-source OS for embedded IoT devices, has an unchecked strcpy in its ATWINC15x0 Wi-Fi driver that copies an SSID into a fixed buffer. A nearby attacker advertising an oversized SSID can corrupt memory, causing a crash or potentially code execution on the device.

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

## How to check

Check whether the firmware is built with MODULE_ATWINC15X0_DYNAMIC_CONNECT enabled and which RIOT version it uses (prior to 2026.04 is affected).

## Fix

Upgrade RIOT to 2026.04 or later and rebuild the firmware.

## Timeline

- 2026-10-23T21:57:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-102693

## From the sources

RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems. Prior to 2026.04, the ATWINC15x0 driver's _atwinc15x0_sta_set_current_ssid function uses strcpy to copy an SSID without checking the destination size. When MODULE_ATWINC15X0_DYNAMIC_CONNECT is enabled, a nearby attacker can advertise a malformed or oversized SSID that is processed during Wi-Fi scanning, causing memory corruption and potentially a hard fault, denial of service, or code execution. This issue is fixed in version 2026.04.

---

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