What is the CVSS score of CVE-2026-3971?

CVE-2026-3971 has a CVSS 4.0 base score of 7.4 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2026-3971?

Within 24 hours: Identify and inventory all Tenda i3 1.0.0.6(2204) devices in production and isolate them from critical network segments. Within 7 days: Implement network-based mitigations (WAF rules blocking malformed requests to /goform/wifiSSIDset, restrict admin interface access to trusted IPs only). Within 30 days: Develop device replacement plan or pursue firmware alternatives from vendor; document timeline with executive leadership.

Tenda CVE-2026-3971

HIGH

Buffer Overflow (CWE-119)

2026-03-12 cna@vuldb.com

Buffer Overflow Tenda

7.4

CVSS 4.0 · NVD

View

Attack ChainAIDerived

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

Access

Authenticate to Tenda i3 router management interface
Delivery

Send crafted HTTP POST request to /goform/wifiSSIDset
Exploit

Inject oversized payload into index/GO parameter
Execution

Trigger stack-based buffer overflow
Impact

Execute arbitrary code with router privileges

Vulnerability Assessment

Weakness	CWE CWE-119 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution,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	Tenda i3 firmware version 1.0.0.6(2204) with /goform/wifiSSIDset endpoint accessible. Attacker requires valid login credentials (PR:L). Remote exploitation possible against devices accessible on network with administrative access enabled.
Impact	CVSS 8.8 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: None. Exploitable via remote/network.
Exploit ScenarioDerived	A remote attacker could exploit this flaw, stack-based buffer overflow.

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

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Stack-based buffer overflow in Tenda i3 firmware version 1.0.0.6(2204) allows authenticated remote attackers to achieve full system compromise through the SSID configuration endpoint. The vulnerability exists in the formwrlSSIDset function due to improper input validation on the index/GO parameter, and public exploit code is available. No patch is currently available, making this a critical risk for affected network devices.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 19:57 CVSS 7.4

A vulnerability has been found in Tenda i3 1.0.0.6(2204). Affected by this vulnerability is the function formwrlSSIDset of the file /goform/wifiSSIDset. [CVSS 8.8 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.

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

Classified as CWE-119 (Buffer Overflow). A vulnerability has been found in Tenda i3 1.0.0.6(2204). Affected by this vulnerability is the function formwrlSSIDset of the file /goform/wifiSSIDset. The manipulation of the argument index/GO leads to stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.4 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

Low

User Interaction

None

Vulnerable system: Confidentiality

High

Vulnerable system: Integrity

High

Vulnerable system: Availability

High

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

DescriptionCVE.org

A vulnerability has been found in Tenda i3 1.0.0.6(2204). Affected by this vulnerability is the function formwrlSSIDset of the file /goform/wifiSSIDset. The manipulation of the argument index/GO leads to stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used.

Executive ViewAI

Why It Matters

A critical remote code execution vulnerability affects Tenda i3 wireless routers (version 1.0.0.6) through improper input validation in the WiFi SSID configuration function. Organizations using this device model face unauthorized network access and potential lateral movement into connected systems, with no vendor patch currently available.

Business Impact: High

Compensating Controls

Implement Web Application Firewall (WAF) rules to filter malicious payloads targeting /goform/wifiSSIDset endpoint; restrict administrative interface access via network ACLs to authorized personnel only; disable remote management features if not operationally required; isolate affected devices to segregated network segments; monitor for suspicious configuration changes and unauthorized access attempts; deploy intrusion detection/prevention systems with signatures for exploitation attempts.

Threat Intelligence Overview

EPSS Score

0.1%

Top 75% exploitable

Data Quality

5 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

VulDB

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 0.1%

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

Open

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +37

PoC: 0

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.