What is the CVSS score of CVE-2026-2138?

CVE-2026-2138 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-2026-2138?

Yes, a public proof-of-concept exploit is available for CVE-2026-2138. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-2138?

Within 24 hours: Identify and inventory all Tenda TX9 devices running affected firmware versions; isolate internet-facing units from critical systems if possible. Within 7 days: Implement network access controls restricting administrative access to TX9 devices; monitor for suspicious routing configuration changes and unauthorized access attempts. Within 30 days: Continuously monitor Tenda security advisories for patch availability; prepare emergency patching procedures; consider replacing devices if patches remain unavailable beyond 30 days.

Tx9 Firmware CVE-2026-2138

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
Exploit

Send crafted SetStaticRouteCfg request
Execution

Overflow buffer in sub_42D03C function
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Weakness	CWE CWE-119 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution,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	Authenticated access to Tenda TX9 web interface (version ≤22.03.02.10_multi). Requires valid login credentials to access /goform/SetStaticRouteCfg endpoint.
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 flaw, 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

Remote code execution in Tenda TX9 firmware versions up to 22.03.02.10_multi through a buffer overflow in the static route configuration function allows authenticated attackers to achieve full system compromise. Public exploit code exists for this vulnerability, significantly increasing the risk of active exploitation. No patch is currently available, making this a critical threat requiring immediate network segmentation or device replacement.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 8.8

A vulnerability was found in Tenda TX9 up to 22.03.02.10_multi. Affected is the function sub_42D03C of the file /goform/SetStaticRouteCfg. [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 found in Tenda TX9 up to 22.03.02.10_multi. Affected is the function sub_42D03C of the file /goform/SetStaticRouteCfg. The manipulation of the argument list results in buffer overflow. The attack can be launched remotely. The exploit has been made public and could be used.

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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 - 19:28 vuln.today

Public exploit code

CVE Published

Feb 08, 2026 - 06:16 nvd

HIGH 8.8

DescriptionCVE.org

A vulnerability was found in Tenda TX9 up to 22.03.02.10_multi. Affected is the function sub_42D03C of the file /goform/SetStaticRouteCfg. The manipulation of the argument list results in buffer overflow. The attack can be launched remotely. The exploit has been made public and could be used.

Executive ViewAI

Why It Matters

A high-severity vulnerability (CVSS 8.8) affecting Tenda TX9 routers up to version 22.03.02.10_multi allows attackers to exploit static routing configuration functions, potentially enabling unauthorized network access or traffic redirection. Organizations using affected Tenda TX9 devices face immediate risk of network compromise, particularly if devices are internet-facing or handle critical traffic.

Business Impact: High

Compensating Controls

Implement network segmentation to restrict direct internet access to TX9 devices; apply WAF rules blocking requests to /goform/SetStaticRouteCfg endpoint if devices are behind web proxies; disable static routing configuration features if not required for operations; restrict administrative access via IP whitelisting and VPN-only management; implement enhanced monitoring and logging of routing table modifications; apply rate-limiting on configuration endpoints.

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.