Tuya arduino-TuyaOpen up to 1.2.0 WiFiMulti off-by-one

CVSS Meta Temp Score
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CTI Interest Score
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7.9$0-$5k0.00

Summaryinfo

A vulnerability has been found in Tuya arduino-TuyaOpen up to 1.2.0 and classified as critical. The affected element is an unknown function of the component WiFiMulti. The manipulation leads to off-by-one. This vulnerability is uniquely identified as CVE-2026-28520. Local access is required to approach this attack. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Tuya arduino-TuyaOpen up to 1.2.0. This issue affects an unknown part of the component WiFiMulti. The manipulation with an unknown input leads to a off-by-one vulnerability. Using CWE to declare the problem leads to CWE-193. A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was disclosed by Maxime Rossi Bellom. The advisory is shared at src.tuya.com. The identification of this vulnerability is CVE-2026-28520 since 02/27/2026. The exploitation is known to be easy. An attack has to be approached locally. Neither technical details nor an exploit are publicly available.

Upgrading to version 1.2.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-12227). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 8.1
VulDB Meta Temp Score: 7.9

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.4
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Off-by-one
CWE: CWE-193 / CWE-189
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: arduino-TuyaOpen 1.2.1

Timelineinfo

02/27/2026 CVE reserved
03/15/2026 +16 days Advisory disclosed
03/15/2026 +0 days VulDB entry created
03/20/2026 +5 days VulDB entry last update

Sourcesinfo

Advisory: src.tuya.com
Researcher: Maxime Rossi Bellom
Status: Confirmed

CVE: CVE-2026-28520 (🔒)
GCVE (CVE): GCVE-0-2026-28520
GCVE (VulDB): GCVE-100-351137
EUVD: 🔒

Entryinfo

Created: 03/15/2026 15:14
Updated: 03/20/2026 23:04
Changes: 03/15/2026 15:14 (76), 03/15/2026 16:43 (1), 03/20/2026 23:04 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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