CVE-2026-4252 Details
Description
A vulnerability was identified in Tenda AC8 16.03.50.11. Affected by this issue is the function check_is_ipv6 of the component IPv6 Handler. The manipulation leads to reliance on ip address for authentication. It is possible to initiate the attack remotely. The exploit is publicly available and might be used.
An authentication bypass vulnerability has been identified in the Tenda AC8 router running firmware version 16.03.50.11. The issue arises in the IPv6 Handler component, specifically within the check_is_ipv6 function. This vulnerability allows the router to skip authentication checks, including cookie validation and password verification, for requests received over IPv6. The flaw can be exploited remotely by appending a specific query parameter to the URL, granting unauthorized access to administrative functions. Exploitation of this vulnerability can be automated with a publicly available proof-of-concept script.
It is recommended to apply restrictive firewall rules to block unauthorized access to the router's administrative interfaces.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 16, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/digitalandrew/tenda_ac8_v5/blob/main/poc_ipv6_auth_bypass.py | [email protected] | Exploit |
| https://vuldb.com/?ctiid.351210 | [email protected] | Permissions RequiredVDB Entry |
| https://vuldb.com/?id.351210 | [email protected] | Third Party AdvisoryVDB Entry |
| https://vuldb.com/?submit.771759 | [email protected] | ExploitThird Party AdvisoryVDB Entry |
| https://www.tenda.com.cn/ | [email protected] | Product |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-287 | Improper Authentication | [email protected] |
| CWE-291 | Reliance on IP Address for Authentication | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| tenda ac8 firmware | 16.03.50.11 |
CPE
Remediation
| |
| tenda ac8 | All versions |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 3, 2026 | Initial Analysis | [email protected] |
| Mar 16, 2026 | New CVE Received | [email protected] |