CVE-2026-4252: Tenda AC8 IPv6 check_is_ipv6 ip address for authentication

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-03-16 · updated 2026-06-17
Weakness: CWE-287

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.

Affected products

Tenda AC8: 16.03.50.11

References

https://github.com/digitalandrew/tenda_ac8_v5/blob/main/poc_ipv6_auth_bypass.py
https://vuldb.com/?ctiid.351210
https://vuldb.com/?id.351210
https://vuldb.com/?submit.771759
https://www.tenda.com.cn/

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