Authentication Bypass Vulnerability in Tenda AC8 by Tenda
CVE-2026-4252

9.3CRITICAL

Key Information:

Vendor

Tenda
Status
Ac8
Vendor
CVE Published:
16 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4252?

A vulnerability has been identified in the Tenda AC8 router that affects the function handling IPv6 address checks, specifically the 'check_is_ipv6' function in the IPv6 Handler component. This flaw allows an attacker to exploit the reliance on the IP address for authentication purposes. When exploited, it enables unauthorized access to system functions by manipulating the authentication process remotely, making the issue significant. Given that exploit vectors are publicly available, it poses a substantial risk to users of the Tenda AC8 router.

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 16.03.50.11

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-2026-4252 - Proof of Concept

References

https://vuldb.com/?id.351210
vdb-entrytechnical-description
https://vuldb.com/?ctiid.351210
signaturepermissions-required
https://vuldb.com/?submit.771759
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
.