CVE-2026-2203 Tenda AC8 Embedded Httpd Service fast_setting_wifi_set buffer overflow

High 8.7 Published 9 Feb 2026 Updated 23 Feb 2026

A buffer overflow in the Tenda AC8 router's embedded HTTP service allows remote attackers to execute arbitrary code via the timeZone argument.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-2203?

CVE-2026-2203 is a high-severity memory corruption vulnerability in Tenda Ac8 Firmware, published on 9 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A flaw has been found in Tenda AC8 16.03.33.05. Affected by this vulnerability is an unknown functionality of the file /goform/fast_setting_wifi_set of the component Embedded Httpd Service. This manipulation of the argument timeZone causes buffer overflow. Remote exploitation of the attack is possible. The exploit has been published and may be used.

Weakness: CWE-120, CWE-119

Which versions are affected by CVE-2026-2203?

It affects 1 product.

Products include Tenda Ac8 Firmware.

How do I fix CVE-2026-2203?

No fix has been published for CVE-2026-2203 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-2203 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2203 exists.

All Tenda Ac8 Firmware vulnerabilities

Sources

Also known as GHSA-527g-r3hr-w3j8.