What is the CVSS score of CVE-2026-24110?

CVE-2026-24110 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-2026-24110?

Yes, a public proof-of-concept exploit is available for CVE-2026-24110. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-24110?

Within 24 hours: inventory all Tenda W20E V4.0br devices in your network and isolate them to a restricted management VLAN. Within 7 days: implement network segmentation to limit access to affected devices and disable DHCP rule management features if operationally feasible, or apply WAF/IDS signatures to block malformed addDhcpRules requests. Within 30 days: plan replacement of affected devices with patched alternatives or vendors with active security support, and monitor Tenda security advisories daily for patch availability.

W20e Firmware CVE-2026-24110

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 malicious DHCP rule with oversized data
Exploit

Trigger sscanf parsing without bounds checking
Execution

Overflow buffer in dhcpsIndex/dhcpsIP/dhcpsMac
Impact

Execute arbitrary code on router

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Weakness	CWE CWE-120 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Buffer copy size validation MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list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	Network access to Tenda W20E V4.0br_V15.11.0.6 router DHCP management interface. No authentication required; exploitable via unauthenticated HTTP requests to vulnerable `addDhcpRules` endpoint on default configurations.
Impact	CVSS 9.8 with PoC.
Exploit ScenarioDerived	Overflow via DHCP rules 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 an eighth buffer overflow in addDhcpRules parameter.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 9.8

Eighth Tenda W20E overflow.

RemediationAI

Update firmware. Eight overflows in one firmware version.

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 - 15:51 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 send overly long addDhcpRules data. When these rules enter the addDhcpRule function and are processed by ret = sscanf(pRule, " %d\t%[^\t]\t%[^\n\r\t]", &dhcpsIndex, dhcpsIP, dhcpsMac);, the lack of size validation for the rules could lead to buffer overflows in dhcpsIndex, dhcpsIP, and dhcpsMac.

Executive ViewAI

Why It Matters

A critical vulnerability in Tenda W20E routers allows remote attackers to crash or compromise affected devices through malformed network configuration requests, with no patch currently available. Organizations using this device model face immediate risk of service disruption and potential network compromise, requiring urgent mitigation measures.

Business Impact: Severe

Compensating Controls

Implement network segmentation to restrict access to affected Tenda W20E devices; deploy IDS/IPS rules to detect and block oversized addDhcpRules payloads; disable DHCP management features if not operationally critical; restrict administrative access to the device web interface via firewall rules; monitor Tenda's security portal for patch release and plan device replacement.

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.