Auth bypass in Tenda Ac8
CVE-2026-4252
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 th…
EPSS: 0.004 (60.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:W/RC:R.
Affected products
- Tenda Ac8 — versions 16.03.50.11
Weakness classification (CWE)
References
- VDB-351210 | Tenda AC8 IPv6 check_is_ipv6 ip address for authentication (vdb-entry, technical-description)
- VDB-351210 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
- Submit #771759 | Tenda AC8 V5 V16.03.50.11 Authentication Bypass Issues (third-party-advisory)
- github.com/digitalandrew/tenda_ac8_v5/blob/main/poc_ipv6_auth_bypass.py (exploit)
- www.tenda.com.cn/ (product)
Frequently asked questions
- What is CVE-2026-4252?
- CVE-2026-4252 is a critical-severity vulnerability in Tenda Ac8, classified under Reliance on IP Address for Authentication. CVSS score: 9.8/10. Published 2026-03-16.
- How severe is CVE-2026-4252?
- Critical severity. CVSS v3 base score is 9.8 out of 10.