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 the attack remotely. The exploit is publicly available and might be used.
Vulnerability class: Broken Authentication
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.021 (81.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.013 · newest: 0.021 · change: +0.008
Affected products
- Tenda Ac8 — versions 16.03.50.11
- Tenda Ac8 Firmware — versions 16.03.50.11
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (Exploit, VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/digitalandrew/tenda_ac8_v5/blob/main/poc_ipv6_auth_bypass.py (Exploit, exploit)
- www.tenda.com.cn/ (Product, product)
Frequently asked questions
- What is CVE-2026-4252?
- CVE-2026-4252 is a critical-severity vulnerability in Tenda Ac8, classified under Improper 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.