What is the CVSS score of CVE-2026-2140?

CVE-2026-2140 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: 0.0%.

Which versions of Tx9 Firmware are affected by CVE-2026-2140?

Tenda TX9 routers (firmware up to 22.03.02.10_multi) contain a critical remote code execution vulnerability with active exploit code available.

Is there a public PoC exploit available for CVE-2026-2140?

Yes, a public proof-of-concept exploit is available for CVE-2026-2140. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-2140?

Within 24 hours: Inventory all Tenda TX9 devices and isolate affected units from production networks if possible. Within 7 days: Contact Tenda for patched firmware availability and begin staged deployment testing in isolated lab environment. Within 30 days: Complete firmware upgrades on all affected devices or replace with alternative vendor equipment if no patch is released.

Tx9 Firmware CVE-2026-2140

HIGH

Buffer Overflow (CWE-119)

2026-02-08 cna@vuldb.com

Buffer Overflow Tenda Tx9 Firmware

8.8

CVSS 3.1 · NVD

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

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. The attack requires valid credentials but can be executed over the network with high impact on confidentiality, integrity, and availability.

Technical ContextAI

Classified as CWE-119 (Buffer Overflow). Affects Tx9 Firmware. 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.

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.