Buffer Overflow Vulnerability in Tenda TX9 Routers
CVE-2026-2140

8.7HIGH

Key Information:

Vendor

Tenda
Status
Tx9
Vendor
CVE Published:
8 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2140?

A vulnerability exists in the Tenda TX9 routers, specifically in the setMacFilterCfg function located at /goform/setMacFilterCfg. An issue arises when the deviceList argument is manipulated, leading to a buffer overflow. This vulnerability can be exploited remotely, allowing potential attackers to execute arbitrary code. Publicly available exploits may increase the risk associated with this vulnerability. Users are encouraged to secure their devices to prevent unauthorized access.

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Deploy the Patch

Affected Version(s)

TX9 22.03.02.10_multi

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-2140 - Proof of Concept

References

https://vuldb.com/?id.344775
vdb-entrytechnical-description
https://vuldb.com/?ctiid.344775
signaturepermissions-required
https://vuldb.com/?submit.747251
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

kdb3169 (VulDB User)
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