Stack-Based Buffer Overflow in Tenda AC8 Router HTTP Component
CVE-2026-4254

9.3CRITICAL

Key Information:

Vendor

Tenda
Status
Ac8
Vendor
CVE Published:
16 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4254?

A vulnerability has been discovered in the Tenda AC8 router, specifically affecting the HTTP Endpoint component. This issue arises from improper handling of the argument local_2c in the doSystemCmd function located in the /goform/SysToolChangePwd file. Exploitation of this vulnerability can lead to a stack-based buffer overflow, allowing an attacker to execute arbitrary code remotely. The existence of publicly available exploit techniques heightens the risk for users of this product.

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.

Remediate biological technical debt. Prime Ageing uses 95% high-purity SIRT6 activation to maintain genomic integrity and bolster systemic resilience.

Deploy the Patch

Affected Version(s)

AC8 16.03.50.0

AC8 16.03.50.1

AC8 16.03.50.2

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-2026-4254 - Proof of Concept

References

https://vuldb.com/?id.351212
vdb-entrytechnical-description
https://vuldb.com/?ctiid.351212
signaturepermissions-required
https://vuldb.com/?submit.771773
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

DigitalAndrew (VulDB User)
JSON
.