What is the CVSS score of CVE-2026-24112?

CVE-2026-24112 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-2026-24112?

Yes, a public proof-of-concept exploit is available for CVE-2026-24112. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-24112?

Within 24 hours: Identify and inventory all Tenda W20E V4.0br_V15.11.0.6 devices in your network and isolate critical instances from sensitive systems. Within 7 days: Implement network segmentation to restrict router admin access, disable remote management features, and deploy network-based detection rules for exploit attempts. Within 30 days: Plan device replacement with alternative vendors or contact Tenda for patched firmware availability; conduct full network security audit for evidence of compromise.

W20e Firmware CVE-2026-24112

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

Craft HTTP request with malicious userInfo parameter
Exploit

Send to addWewifiWhiteUser function
Execution

Trigger sscanf 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Weakness	CWE CWE-120 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Buffer copy size validation MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list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 running firmware V4.0br_V15.11.0.6 with the userInfo parameter exposed in addWewifiWhiteUser function accessible without authentication over network.
Impact	CVSS 9.8 with PoC.
Exploit ScenarioDerived	Buffer overflow.

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 ninth buffer overflow in yet another CGI endpoint.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 9.8

Ninth 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 03, 2026 - 20:16 vuln.today

Public exploit code

CVE Published

Mar 02, 2026 - 16:16 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 specifying the value of userInfo. When userInfo is passed into the addWewifiWhiteUser function and processed by sscanf without size validation, it could lead to a buffer overflow vulnerability.

Executive ViewAI

Why It Matters

A critical vulnerability (CVE-2026-24112) affects Tenda W20E routers with a 9.8 CVSS score, allowing unauthenticated remote attackers to compromise affected devices through userInfo parameter manipulation. Organizations using this router model face immediate risk of unauthorized access, data exfiltration, and network compromise, with active exploits already circulating and no vendor patch available.

Business Impact: Severe

Compensating Controls

Disable remote management and WAN access to router admin interface; implement strict network segmentation isolating affected routers from critical infrastructure; deploy WAF/IDS rules blocking suspicious userInfo parameter values; restrict router administrative access to trusted IP addresses only; consider replacing affected devices with patched alternatives or different vendors; monitor router logs for exploitation attempts; implement network access controls limiting traffic to/from affected devices.

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.