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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "1.0.0.0"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "product": "a21", "vendor": "tenda"}], "analysis": {"en": {"generated_at": "2026-04-18T19:38:48.380553+00:00", "value": {"mitigation_remediation": ["Check Tenda\u2019s website or product support page for a firmware update that addresses the buffer\u2011overflow flaw and install the latest available firmware.", "If no updated firmware is available, disable remote management of the router\u2019s web interface or restrict access to trusted IP ranges to eliminate the attack surface.", "Implement network\u2011level controls, such as firewall or ACL rules, to block or limit POST requests to /goform/fast_setting_wifi_set that carry an ssid parameter larger than the router\u2019s maximum expected length, preventing malformed inputs from reaching the vulnerable code."], "summary": {"action": "Update Firmware", "impact": "Remote Code Execution via Stack-Based Buffer Overflow"}, "threat_synthesis": {"affected_systems": "All Tenda A21 routers running firmware version 1.0.0.0 are affected. The vulnerability is only reported for this version, and no other firmware releases or product variants are listed. The flaw resides in the web\u2011based configuration interface, making remote access a vector for exploitation.", "description_and_impact": "A stack\u2011based buffer overflow exists in Tenda A21 routers\u2019 firmware 1.0.0.0, specifically within the form_fast_setting_wifi_set function of the /goform/fast_setting_wifi_set endpoint. A crafted ssid parameter that exceeds the expected input size can trigger the overflow, potentially allowing an attacker to inject and execute arbitrary code on the device. This flaw is classified as a classic buffer overflow (CWE\u2011119) and stack corruption (CWE\u2011121).", "risk_and_exploitability": "The flaw carries a CVSS score of 8.7, indicating high severity, but the EPSS score is less than 1\u202f%, showing that widespread exploitation is unlikely at present. The vulnerability is not listed in CISA\u2019s KEV catalog. An attacker only needs to send a maliciously crafted POST request to the /goform/fast_setting_wifi_set endpoint from a remote location; based on the description of remote exploitation via the web interface, it is inferred that the vulnerable endpoint does not require authentication, making the attack remotely accessible. Published proof\u2011of\u2011concept code demonstrates that an exploit can be triggered remotely, implying that the risk remains significant for exposed devices."}}}}, "created": "2026-02-23T14:31:48.719040+00:00", "updated": "2026-04-18T19:45:08.968632+00:00", "vendors": ["tenda", "tenda$PRODUCT$a21"]}