Security readout for executives and security teams
Plain-English summary
CVE-2026-28522 can crash devices or firmware using vulnerable arduino-TuyaOpen WiFiUDP code. An attacker must be on the same local network and can cause a denial-of-service condition by triggering a null pointer dereference with malicious UDP traffic.
Executive priority
Treat this as a high-priority availability risk for affected IoT or embedded products, especially in shared LAN environments. Urgency is lower for systems without arduino-TuyaOpen or local UDP exposure.
Technical view
arduino-TuyaOpen before 1.2.1 has a CWE-476 null pointer dereference in WiFiUDP. The CVSS 4.0 score is 7.1 high, with adjacent-network access, low complexity, no privileges, no user interaction, and high vulnerable-system availability impact.
Likely exposure
Exposure is most likely in embedded, IoT, or Arduino-style firmware projects that include arduino-TuyaOpen before 1.2.1 and accept local-network UDP traffic.
Exploitation context
The source bundle says exploitation requires same-LAN access and a large volume of malicious UDP packets. KEV is false, and no cited source establishes active exploitation in the wild.
Researcher notes
Evidence supports a local-network denial-of-service via WiFiUDP null pointer dereference. Public sources provided do not include exploit code, detailed packet conditions, affected downstream devices, or confirmation of active exploitation.
Mitigation direction
- Upgrade arduino-TuyaOpen to version 1.2.1 or later where used.
- Review Tuya vendor guidance before releasing updated firmware.
- Restrict untrusted LAN access to affected devices where feasible.
- Segment IoT networks from user and guest networks.
- Monitor affected segments for abnormal UDP traffic volume.
Validation and detection
- Inventory firmware and repositories for arduino-TuyaOpen usage.
- Confirm dependency versions and flag anything before 1.2.1.
- Identify products using the WiFiUDP component.
- Review network placement for same-LAN attacker exposure.
- Validate fixes in a controlled lab, not production traffic.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-476: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-28522 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.1 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N——VulnCheckCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H2.83.6VulnCheckVulnerability scoring details
Base CVSS 4.0 score
7.1HighVector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Tuya SRC Security AdvisoryCVE reference, VulnCheck · vendor-advisory
- arduino-TuyaOpen GitHub RepositoryCVE reference, VulnCheck · product
- VulnCheck Advisory: arduino-TuyaOpen WiFiUDP Null Pointer Dereference Denial of ServiceCVE reference, VulnCheck · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.