Stack-based Buffer Overflow in Tenda HG9 Diagnostic Ping Endpoint
CVE-2026-2909

8.7HIGH

Key Information:

Vendor

Tenda
Status
Hg9
Vendor
CVE Published:
22 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2909?

A stack-based buffer overflow vulnerability exists in the Tenda HG9 (version 300001138) within the Diagnostic Ping Endpoint, specifically in the /boaform/formPing file. This vulnerability can be exploited remotely by manipulating the pingAddr argument, potentially allowing an attacker to execute arbitrary code. The exploit details have become public, increasing the urgency for users to apply security measures to mitigate the associated risks. Users are advised to stay updated with vendor patches and advisories.

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Affected Version(s)

HG9 300001138

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-2026-2909 - Proof of Concept

References

https://vuldb.com/?id.347218
vdb-entrytechnical-description
https://vuldb.com/?ctiid.347218
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https://vuldb.com/?submit.755211
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

LINXI666 (VulDB User)
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