What’s Vulnerable › Vulnerabilities

CVE-2026-28520: arduino-TuyaOpen WiFiMulti Single-Byte Buffer Overflow Remote Code Execution

• Severity: high (CVSS 8.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-16 · updated 2026-06-17
• Weakness: CWE-193

Description

arduino-TuyaOpen before version 1.2.1 contains a single-byte buffer overflow vulnerability in the WiFiMulti component. When the victim's smart hardware connects to an attacker-controlled AP hotspot, the attacker can exploit the overflow to execute arbitrary code on the affected embedded device.

Affected products

• Tuya arduino-TuyaOpen: before 1.2.1 — fixed in 1.2.1

How to fix

Upgrade to a fixed version: Tuya arduino-TuyaOpen 1.2.1. Check the vendor advisory for mitigations.

References

• https://github.com/tuya/arduino-TuyaOpen
• https://src.tuya.com/announcement/32
• https://www.vulncheck.com/advisories/arduino-tuyaopen-wifimulti-single-byte-buffer-overflow-remote-code-execution

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