What is the CVSS score of CVE-2026-20407?

CVE-2026-20407 has a CVSS 3.1 base score of 9.3 (Critical). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-20407?

Within 24 hours: Inventory all systems with vulnerable WLAN drivers and assess user base size. Within 7 days: Implement network segmentation to restrict local access capabilities and disable unnecessary WLAN features if operationally feasible; communicate risk to affected user populations. Within 30 days: Monitor vendor advisories for patch release; evaluate alternative drivers or hardware if patch timeline becomes unacceptable; conduct security assessments on systems with high-privilege users.

Nbiot Sdk CVE-2026-20407

CRITICAL

Out-of-bounds Write (CWE-787)

2026-02-02 security@mediatek.com

Privilege Escalation Mediatek Nbiot Sdk

9.3

CVSS 3.1 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Load malicious wlan driver module
Exploit

Trigger missing bounds check in STA driver
Execution

Write beyond allocated buffer
Impact

Escalate privileges to system level

Vulnerability Assessment

Weakness	CWE CWE-787 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, write limits MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Local access to target system with ability to load kernel modules or interact with wlan STA driver interface. Vulnerable wlan driver must be loaded and accessible to unprivileged users.
Impact	CVSS 9.3. Android local privilege escalation via WiFi driver.
Exploit ScenarioDerived	Malicious app or crafted WiFi traffic triggers OOB write in WLAN driver, escalating to System privileges.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.

No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Out-of-bounds write in Android WLAN STA driver due to missing bounds check allows local privilege escalation to System with user interaction.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:01 CVSS 9.3

WLAN driver privilege escalation in Android.

RemediationAI

Apply Android security update.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

CWE-787 OOB write in WLAN STA (station) driver. Missing bounds check on wireless driver data.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.3 CRITICAL

AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

In wlan STA driver, there is a possible escalation of privilege due to a missing bounds check. This could lead to local escalation of privilege with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00464377; Issue ID: MSV-4905.

Executive ViewAI

Why It Matters

A critical privilege escalation vulnerability exists in wireless driver software that could allow standard users to gain administrative access to affected systems. Without an available patch, all devices running vulnerable WLAN drivers require immediate mitigation to prevent potential compromise of sensitive data and system integrity.

Business Impact: Severe

Compensating Controls

Implement strict application whitelisting to restrict execution of unauthorized binaries; disable WLAN driver features not required for operations; enforce mandatory code signing verification; isolate affected systems using network access controls and VLANs where possible; monitor and log all user privilege escalation attempts; require multi-factor authentication for administrative access; restrict local user account creation and guest access; monitor vendor security bulletins for patch availability on weekly basis.

Threat Intelligence Overview

EPSS Score

0.0%

Top 99% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC No

EPSS 0.0%

Patch available No

Active threat No

Deciding rule

CRITICAL severity

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Small

Automatable· derived

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +46

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Privilege Escalation HIGH

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.