Security readout for executives and security teams
Plain-English summary
CVE-2026-20407 is a critical MediaTek Wi-Fi driver flaw that could let local code gain higher privileges. It affects specific MediaTek chipset models. The public record says no user interaction is needed, but local execution is required. No cited source reports active exploitation.
Executive priority
Treat as urgent for fleets containing affected MediaTek Wi-Fi chipsets. The business risk is local privilege escalation, potentially allowing compromise beyond normal user permissions. Prioritize asset identification and vendor update deployment.
Technical view
The issue is a missing bounds check in the MediaTek wlan STA driver, mapped to CWE-787. The CVSS 3.1 score is 9.3 with local attack vector, low complexity, no user interaction, changed scope, and high confidentiality, integrity, and availability impact. Patch ID is WCNCR00464377; Issue ID is MSV-4905.
Likely exposure
Exposure is likely limited to systems using MediaTek chipsets MT7902, MT7920, MT7921, MT7922, MT7925, or MT7927 with the vulnerable wlan STA driver. The CVE record lists other versions as unaffected by default.
Exploitation context
The cited sources describe local privilege escalation with user execution privileges needed and no user interaction. The CVE is not marked KEV, and no provided source states active exploitation or public exploit availability.
Researcher notes
Public detail is limited to the CVE record and MediaTek bulletin reference. Do not assume exploitability on every product using these chipsets; confirm driver integration, patch level, and OEM distribution status. No weaponization details are provided in the cited sources.
Mitigation direction
- Review MediaTek’s February 2026 bulletin for CVE-2026-20407 guidance.
- Apply OEM or vendor driver/firmware updates referencing Patch ID WCNCR00464377.
- Prioritize devices with affected MediaTek Wi-Fi chipsets.
- Limit execution of untrusted local applications until updates are applied.
Validation and detection
- Inventory endpoints and products for listed MediaTek chipset models.
- Confirm installed Wi-Fi driver or firmware is covered by vendor updates.
- Check OEM advisories for CVE-2026-20407 or Patch ID WCNCR00464377.
- Document systems where affected chipsets are absent or patched.
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-787: 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-2026-20407 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
- Critical
- CVSS
- 9.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
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.
CVSS vector scores
1 official scoreWe 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:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H2.56Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.3CriticalVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://corp.mediatek.com/product-security-bulletin/February-2026CVE reference
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.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.