A21 Firmware CVE-2026-2872
HIGHCVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionNVD
A security vulnerability has been detected in Tenda A21 1.0.0.0. This vulnerability affects the function set_device_name of the file /goform/setBlackRule of the component MAC Filtering Configuration Endpoint. Such manipulation of the argument devName/mac leads to stack-based buffer overflow. The attack may be performed from remote. The exploit has been disclosed publicly and may be used.
AnalysisAI
Stack-based buffer overflow in Tenda A21 1.0.0.0 MAC filtering configuration allows remote authenticated attackers to achieve full system compromise through malicious devName/mac parameters. Public exploit code exists for this vulnerability, which remains unpatched. …
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RemediationAI
Within 24 hours: Inventory all Tenda A21 1.0.0.0 devices and assess internet exposure; isolate or restrict access to the /goform/setBlackRule endpoint. Within 7 days: Implement network segmentation to limit device management access to trusted administrative networks only; document all affected devices. …
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External POC / Exploit Code
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