---
id: CVE-2026-102693
title: 'RIOT: Remote Stack Buffer Overflow in ATWINC15x0 driver via unsanitized SSID'
summary: >-
  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
  w…
severity: critical
cvss: 9.6
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-120
  - CWE-121
vendor: RIOT-OS
product: RIOT
affected:
  - RIOT < 2026.04
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T19:22:51.330478Z'
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:23:03.423Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-102693'
references:
  - url: 'https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-gwgv-6976-hxrg'
    label: 'https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-gwgv-6976-hxrg'
  - url: >-
      https://github.com/RIOT-OS/RIOT/commit/5209c1b84f9771342f079b7d5d94d8207fdd5f0a
    label: >-
      https://github.com/RIOT-OS/RIOT/commit/5209c1b84f9771342f079b7d5d94d8207fdd5f0a
  - url: 'https://github.com/RIOT-OS/RIOT/releases/tag/2026.04'
    label: 'https://github.com/RIOT-OS/RIOT/releases/tag/2026.04'
tags:
  - cve.org
ingestedAt: '2026-10-16T17:24:46.894Z'
---

## Overview

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.

## Affected

- `RIOT < 2026.04`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.