What is the CVSS score of CVE-2026-20423?

CVE-2026-20423 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-20423?

Within 24 hours: Inventory all systems and applications using Nbiot SDK and assess exposure scope; disable Nbiot SDK features if non-critical. Within 7 days: Implement network segmentation to isolate affected systems; restrict local access privileges and enforce principle of least privilege for user accounts. Within 30 days: Monitor vendor communications for patch availability; develop and test patching procedures; implement enhanced logging and monitoring for privilege escalation attempts on affected systems.

Nbiot Sdk CVE-2026-20423

HIGH

Exposed Dangerous Method or Function (CWE-749)

2026-03-02 security@mediatek.com

Privilege Escalation Mediatek Nbiot Sdk

7.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

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

Access

Local user executes malicious application
Delivery

Application triggers wlan STA driver code path
Exploit

Missing bounds check allows out-of-bounds write
Execution

Kernel memory corruption
Impact

Privilege escalation to higher level

Vulnerability Assessment

Weakness	CWE CWE-749 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V8 - Authorization Dangerous method exposure prevention
Exploitation Conditions	Local user account on device with wlan STA driver installed; vulnerable wlan driver firmware or kernel module without patch WCNCR00465314; ability to execute local application code
Impact	CVSS 7.8 (HIGH). Attack vector: Local. Complexity: Low. Privileges required: Low. User interaction: None. Exploitable via local access.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to local escalation of privilege with User execution privileges needed.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Nbiot Sdk contains a vulnerability that allows attackers to local escalation of privilege with User execution privileges needed (CVSS 7.8).

RemediationAI

Monitor vendor advisories for a patch.

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

affects Nbiot Sdk. In wlan STA driver, there is a possible out of bounds write 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: WCNCR00465314; Issue ID: MSV-4956.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.8 HIGH

AV:L/AC:L/PR:L/UI:N/S:U/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

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

In wlan STA driver, there is a possible out of bounds write 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: WCNCR00465314; Issue ID: MSV-4956.

Executive ViewAI

Why It Matters

A high-severity privilege escalation vulnerability in Nbiot SDK allows local attackers with user-level access to gain elevated system privileges. This poses significant risk to organizations deploying Nbiot-dependent systems, particularly IoT and embedded device infrastructures, potentially enabling attackers to compromise system integrity and access sensitive data.

Business Impact: High

Compensating Controls

Implement strict access controls limiting user execution privileges; isolate Nbiot SDK systems on network segments with restricted lateral movement; disable unnecessary Nbiot SDK features and services; deploy host-based intrusion detection systems (HIDS) to monitor for privilege escalation attempts; enforce application whitelisting on affected systems; conduct regular privilege access reviews; monitor and log all user-level process executions for anomalies.

Threat Intelligence Overview

EPSS Score

0.0%

Top 98% 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 HIGH

CISA KEV No

Public POC No

EPSS 0.0%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

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

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +39

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.