Stack-Based Buffer Overflow in Tenda RX3 Router by Tenda
CVE-2026-2187

8.7HIGH

Key Information:

Vendor

Tenda
Status
Rx3
Vendor
CVE Published:
8 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2187?

A stack-based buffer overflow vulnerability exists in the Tenda RX3 router, specifically within the set_qosMib_list function of the /goform/formSetQosBand file. This weakness allows an attacker to manipulate the argument list, potentially leading to unauthorized remote code execution. Given that the exploit has been publicly disclosed, immediate action is recommended for users to secure their devices to prevent potential exploitation.

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Affected Version(s)

RX3 16.03.13.11

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-2026-2187 - Proof of Concept

References

https://vuldb.com/?id.344890
vdb-entrytechnical-description
https://vuldb.com/?ctiid.344890
signaturepermissions-required
https://vuldb.com/?submit.749721
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

LX-66-LX (VulDB User)
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