CVE-2026-102693: CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in RIOT-OS RIOT
Description
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.
CVSS v3.1
Score 9.6critical
Affected software
RIOT-OS
RIOT
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
RIOT-OS versions before 2026.04 contain a classic buffer overflow vulnerability (CWE-120) in the ATWINC15x0 Wi-Fi driver. Specifically, the _atwinc15x0_sta_set_current_ssid function copies SSID strings using strcpy without validating the destination buffer size. When the MODULE_ATWINC15X0_DYNAMIC_CONNECT feature is enabled, a nearby attacker can broadcast a maliciously crafted SSID that triggers memory corruption during Wi-Fi scanning. This vulnerability can lead to a hard fault, denial of service, or potentially allow code execution. The vulnerability has a CVSS 3.1 score of 9.6, indicating critical severity. The issue is resolved in RIOT-OS version 2026.04.
Potential Impact
Exploitation of this vulnerability allows a remote attacker within Wi-Fi range to cause memory corruption by sending a malformed or oversized SSID. This can result in a hard fault (crash), denial of service, or potentially arbitrary code execution on affected devices running vulnerable RIOT-OS versions. The vulnerability affects confidentiality, integrity, and availability (all high impact).
Mitigation Recommendations
This vulnerability is fixed in RIOT-OS version 2026.04. Users and developers should upgrade to version 2026.04 or later to remediate this issue. No other mitigations are specified or required if the system is updated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-09-29T16:10:04.077Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad259172cdf04f6560f7527
Added to database: 10/16/2026, 17:04:23 UTC
Last enriched: 10/16/2026, 17:18:26 UTC
Last updated: 10/16/2026, 19:49:15 UTC
Views: 8
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