What is the CVSS score of CVE-2026-24109?

CVE-2026-24109 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Is there a public PoC exploit available for CVE-2026-24109?

Yes, a public proof-of-concept exploit is available for CVE-2026-24109. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-24109?

Within 24 hours: Inventory all Tenda W20E V4.0br_V15.11.0.6 devices across the organization and isolate affected units from production networks. Within 7 days: Evaluate replacement options or identify alternative network equipment; implement network segmentation to restrict device access; document all compensating controls deployed. Within 30 days: Complete migration away from affected devices or retire them entirely pending vendor patch availability.

W20e Firmware CVE-2026-24109

CRITICAL

Classic Buffer Overflow (CWE-120)

2026-03-02 cve@mitre.org

Buffer Overflow Tenda W20e Firmware

9.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

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

Access

Send HTTP request with crafted picName parameter
Exploit

Trigger sprintf buffer overflow
Impact

Execute arbitrary code on device

Vulnerability Assessment

Weakness	CWE CWE-120 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Buffer copy size validation MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list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	Tenda W20E V4.0br_V15.11.0.6 with vulnerable web interface accepting picName parameter in default configuration. No authentication required for remote exploitation.
Impact	CVSS 9.8 with PoC.
Exploit ScenarioDerived	Overflow via crafted parameter.

Act Now Prioritize within 24-48h. Why: CRITICAL severity + public POC available.

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Tenda W20E has a third buffer overflow in a different CGI parameter.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 9.8

Third Tenda W20E overflow.

RemediationAI

Update firmware.

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-120.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Mar 05, 2026 - 16:16 vuln.today

Public exploit code

CVE Published

Mar 02, 2026 - 15:16 nvd

CRITICAL 9.8

DescriptionCVE.org

An issue was discovered in Tenda W20E V4.0br_V15.11.0.6. Attackers may exploit the vulnerability by controlling the value of picName. When this value is used in sprintf without validating variable sizes, it could lead to a buffer overflow vulnerability.

Executive ViewAI

Why It Matters

A critical remote code execution vulnerability (CVE-2026-24109) affects Tenda W20E wireless devices with no vendor patch currently available. Organizations using this device model face immediate risk of complete system compromise, unauthorized network access, and potential lateral movement into corporate networks if these devices connect to business infrastructure.

Business Impact: Severe

Compensating Controls

Network segmentation via VLAN isolation; restrict device administrative access via firewall rules; disable remote management features if supported; monitor for suspicious picName parameter patterns via WAF/IDS; implement strict network access controls limiting device connectivity; consider disabling the affected functionality if feature documentation becomes available; maintain offline backups of critical configurations.

Threat Intelligence Overview

EPSS Score

0.1%

Top 84% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

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 Yes

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

CRITICAL severity + public POC available

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

Out-of-Cycle

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +49

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.