CVE-2026-2871 Tenda A21 SetIpMacBind fromSetIpMacBind stack-based overflow
A remote attacker can trigger a stack-based buffer overflow in the Tenda A21 router's IP-MAC binding function, potentially leading to arbitrary code execution.
- 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-2026-2871?
CVE-2026-2871 is a high-severity memory corruption vulnerability in Tenda A21, published on 21 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A weakness has been identified in Tenda A21 1.0.0.0. This affects the function fromSetIpMacBind of the file /goform/SetIpMacBind. This manipulation of the argument list causes stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks.
Which versions are affected by CVE-2026-2871?
It affects 1 product.
Products include Tenda A21 Firmware.
How do I fix CVE-2026-2871?
No fix has been published for CVE-2026-2871 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-2026-2871 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2871 exists.
Other vulnerabilities in Tenda A21
- CVE-2026-2870 Tenda A21 formSetQosBand set_qosMib_list stack-based overflow
- CVE-2026-2872 Tenda A21 MAC Filtering Configuration Endpoint setBlackRule set_device_name stack-based overflow
- CVE-2026-2873 Tenda A21 openSchedWifi setSchedWifi stack-based overflow
- CVE-2026-2874 Tenda A21 fast_setting_wifi_set form_fast_setting_wifi_set stack-based overflow
- CVE-2026-2886 Tenda A21 SetOnlineDevName set_device_name stack-based overflow
Sources
Also known as GHSA-73gf-5w78-3r4q.