Stack-based Buffer Overflow in Tenda F1202 Router Software
CVE-2026-9431

8.7HIGH

Key Information:

Vendor

Tenda
Status
F1202
Vendor
CVE Published:
25 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-9431?

A stack-based buffer overflow vulnerability exists in the Tenda F1202 router in version 1.2.0.20(408). This issue arises from improper validation of the 'opttype' argument in the fromPptpUserAdd function within the '/goform/PptpUserAdd' file. An attacker can exploit this flaw remotely, leading to potential unauthorized access and manipulation of the system. The exploit code for this vulnerability is publicly available, underscoring the need for immediate mitigation measures to protect the affected systems.

Affected Version(s)

F1202 1.2.0.20(408)

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-2026-9431 - Proof of Concept

References

https://vuldb.com/vuln/365412
vdb-entrytechnical-description
https://vuldb.com/vuln/365412/cti
signaturepermissions-required
https://vuldb.com/submit/813916
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

LtzHuster2 (VulDB User)
.