CVE-2026-28521

Memory disclosure and interruption via unchecked DP index

Published Mar 15, 2026 · Updated Mar 15, 2026

Out-of-bounds read in Tuya arduino-tuyaopen before 1.2.1 allows attackers controlling its cloud service to disclose memory or interrupt devices. TuyaIoTCloudClass::eventGetDpId dereferences event->value.dpobj->dps[index] without validating the DP array pointers or checking index against dpscnt. Reachability requires hijacking or controlling the Tuya cloud service and sending crafted DP event data; the reported outcomes are memory disclosure and denial of service.

CVSS severity7.0
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Tuya arduino-tuyaopen before 1.2.1 allows attackers controlling its cloud service to disclose memory or interrupt devices. TuyaIoTCloudClass::eventGetDpId dereferences event->value.dpobj->dps[index] without validating the DP array pointers or checking index against dpscnt. Reachability requires hijacking or controlling the Tuya cloud service and sending crafted DP event data; the reported outcomes are memory disclosure and denial of service.

The record

CVE
CVE-2026-28521
Published
Mar 15, 2026
Updated
Mar 15, 2026
Vendor
Tuya
Product
arduino-tuyaopen
Classifications
CWE-125, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.2.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Tuya · arduino-tuyaopenversion=0 <1.2.1

Published CVSS scores

7.7VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
7.0VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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