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Tx9 Firmware CVE-2026-2140

HIGH
Buffer Overflow (CWE-119)
2026-02-08 cna@vuldb.com
Buffer Overflow Tx9 Firmware
8.8
CVSS 3.1 · NVD
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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

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
PoC Detected
Feb 10, 2026 - 19:28 vuln.today
Public exploit code
CVE Published
Feb 08, 2026 - 07:16 nvd
HIGH 8.8

DescriptionCVE.org

A vulnerability was identified in Tenda TX9 up to 22.03.02.10_multi. Affected by this issue is the function sub_4223E0 of the file /goform/setMacFilterCfg. Such manipulation of the argument deviceList leads to buffer overflow. The attack may be launched remotely. The exploit is publicly available and might be used.

AnalysisAI

Remote code execution in Tenda TX9 firmware through version 22.03.02.10_multi allows authenticated attackers to achieve complete system compromise via a buffer overflow in the /goform/setMacFilterCfg endpoint. Public exploit code exists for this vulnerability, and no patch is currently available. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to Tenda TX9 device
Exploit
Send crafted POST request to /goform/setMacFilterCfg
Execution
Overflow deviceList parameter in sub_4223E0
Impact
Execute arbitrary code with device privileges
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Vulnerability AssessmentAI

Exploitation Tenda TX9 router firmware version 22.03.02.10_multi or earlier. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 8.8 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A remote attacker could exploit this flaw, buffer overflow.
Remediation Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory all Tenda TX9 devices and isolate affected units from production networks if possible. …

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CVE-2026-2140 vulnerability details – vuln.today
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