Buffer Overflow Vulnerability in Tenda HG10 Boa Web Server
CVE-2026-85109

9.3CRITICAL

Key Information:

Vendor

Tenda
Status
Hg10
Vendor
CVE Published:
3 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-85109?

A vulnerability in the Tenda HG10 300001138 affects the Boa Web Server, specifically in the function formLogin located in /boaform/formLogin. An attacker can exploit this vulnerability by manipulating the Username argument, leading to a buffer overflow condition. This flaw can be exploited remotely, posing significant security risks. The details of this exploit have been publicly disclosed, allowing potential malicious actors to use it against vulnerable devices.

Affected Version(s)

HG10 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-2026-85109 - Proof of Concept

References

https://vuldb.com/vuln/398315
vdb-entrytechnical-description
https://vuldb.com/vuln/398315/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-85109
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
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

sunnyyaya (VulDB User)
.