What is the CVSS score of CVE-2026-2139?

CVE-2026-2139 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Is there a public PoC exploit available for CVE-2026-2139?

Yes, a public proof-of-concept exploit is available for CVE-2026-2139. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-2139?

Within 24 hours: Identify all Tenda TX9 devices in your network and isolate affected units from critical systems; document inventory and affected firmware versions. Within 7 days: Disable the /goform/fast_setting_wifi_set function if technically feasible, implement network segmentation to limit router access, and establish monitoring for exploitation attempts. Within 30 days: Contact Tenda for patch availability and timeline; if no patch is forthcoming, evaluate replacement with a vendor offering active security support or consider discontinuation of affected devices.

Tx9 Firmware CVE-2026-2139

HIGH

Buffer Overflow (CWE-119)

2026-02-08 cna@vuldb.com

Buffer Overflow Tenda Tx9 Firmware

8.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

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

Access

Authenticate to Tenda TX9 device
Delivery

Send POST request to /goform/fast_setting_wifi_set
Exploit

Inject oversized string in ssid parameter
Execution

Overflow buffer in sub_432580
Impact

Execute arbitrary code

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Weakness	CWE CWE-119 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution,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 TX9 device running firmware version 22.03.02.10_multi or earlier; attacker must have valid login credentials to access the /goform/fast_setting_wifi_set endpoint; device must be network-accessible.
Impact	CVSS 8.8 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: None. Exploitable via remote/network. Public exploit/POC available.
Exploit ScenarioDerived	A remote attacker could exploit this vulnerability to compromise the affected system.

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

Buffer overflow in Tenda TX9 firmware versions up to 22.03.02.10_multi allows authenticated remote attackers to achieve full system compromise through a malicious SSID parameter in the WiFi configuration interface. Public exploit code is available for this vulnerability, and no patch has been released. The high CVSS score of 8.8 reflects the ability to execute arbitrary code with complete confidentiality, integrity, and availability impact.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 8.8

A vulnerability was determined in Tenda TX9 up to 22.03.02.10_multi. Affected by this vulnerability is the function sub_432580 of the file /goform/fast_setting_wifi_set. [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). Affects Tx9 Firmware. A vulnerability was determined in Tenda TX9 up to 22.03.02.10_multi. Affected by this vulnerability is the function sub_432580 of the file /goform/fast_setting_wifi_set. This manipulation of the argument ssid causes buffer overflow. The attack may be initiated remotely. The exploit has been publicly disclosed and may be utilized.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.8 HIGH

AV:N/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

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Feb 10, 2026 - 19:29 vuln.today

Public exploit code

CVE Published

Feb 08, 2026 - 07:15 nvd

HIGH 8.8

DescriptionCVE.org

A vulnerability was determined in Tenda TX9 up to 22.03.02.10_multi. Affected by this vulnerability is the function sub_432580 of the file /goform/fast_setting_wifi_set. This manipulation of the argument ssid causes buffer overflow. The attack may be initiated remotely. The exploit has been publicly disclosed and may be utilized.

Executive ViewAI

Why It Matters

A HIGH severity vulnerability (CVSS 8.8) affects Tenda TX9 WiFi routers up to version 22.03.02.10_multi, with public exploits already available. Organizations using these devices face immediate risk of unauthorized access and network compromise, though current exploitation activity remains minimal (0.1% EPSS). This requires urgent action given the lack of available patches and active public exploit code.

Business Impact: High

Compensating Controls

Implement network segmentation to restrict management access to affected routers; disable remote management interfaces; deploy WAF or network intrusion detection rules to monitor and block requests to /goform/fast_setting_wifi_set; restrict administrative access by IP address; enable detailed logging of router configuration changes; consider implementing a reverse proxy to control access to affected endpoints; monitor for suspicious WiFi configuration modifications.

Threat Intelligence Overview

EPSS Score

0.1%

Top 73% exploitable

Exploit

POC

Public exploit code exists

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 Yes

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

Poc

System Exposure· derived

Open

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +44

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.