CVE-2026-28520: arduino-TuyaOpen before version 1.2.1 contains a single-byte buffer overflow vulnerability in the WiFiMulti co

Q: How do I fix CVE-2026-28520?

arduino-tuyaopen: upgrade to 1.2.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-28520 being exploited?

CVE-2026-28520 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-28520 affect?

CVE-2026-28520 affects arduino-tuyaopen. Severity is high (CVSS 8.4). 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

Routine

HIGH 8.4UPGRADE

CVE-2026-28520 is a high-severity flaw (CVSS 8.4) affecting arduino-tuyaopen. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.4 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-193
Published	2026-03-16
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: tuya

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-16 14:19 UTCPublished CVE record published
2026-06-17 10:28 UTCUpdated Record last modified

tuya arduino-tuyaopen UPGRADE

Affected: < 1.2.1

Fixed in: 1.2.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy arduino-tuyaopen || rpm -q arduino-tuyaopen || arduino-tuyaopen --version

2. UPGRADE to 1.2.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade arduino-tuyaopen

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade arduino-tuyaopen

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-28520?

arduino-tuyaopen: upgrade to 1.2.1. Exact commands for each OS are on this page.

Is CVE-2026-28520 being exploited?

CVE-2026-28520 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-28520 affect?

CVE-2026-28520 affects arduino-tuyaopen. Severity is high (CVSS 8.4). 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

How urgent is CVE-2026-28520?

Priority 32/100. High severity

Related CVEs

CVE-2026-28522 MEDIUM 6.5 UPGRADE arduino-TuyaOpen before version 1.2.1 contains a null pointer dereference vulnerability in the WiFiUDP compone
CVE-2026-28521 HIGH 7.7 UPGRADE arduino-TuyaOpen before version 1.2.1 contains an out-of-bounds memory read vulnerability in the TuyaIoT compo
CVE-2026-28519 HIGH 8.8 UPGRADE arduino-TuyaOpen before version 1.2.1 contains a heap-based buffer overflow vulnerability in the DnsServer com

References

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