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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "1.0.0.5"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "F456", "source": "cna", "vendor": "Tenda"}, "product": "f456", "vendor": "tenda"}], "analysis": {"en": {"generated_at": "2026-04-28T05:21:37.320324+00:00", "value": {"mitigation_remediation": ["Apply the latest firmware update from Tenda that removes the buffer overflow flaw.", "If a firmware update is not immediately available, restrict remote access to the router\u2019s web administration interface by configuring the router\u2019s firewall or the network firewall to block inbound traffic to port 80/443 for the /goform/addressNat endpoint.", "In environments where network segmentation is possible, keep the router\u2019s management interface in a separate VLAN that is not reachable from untrusted networks, ensuring the vulnerable endpoint can only be accessed by trusted management hosts."], "summary": {"action": "Patch ASAP", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "This defect affects the Tenda F456 model running firmware version 1.0.0.5. No other vendor or product variants are listed as vulnerable in the official CNA data.", "description_and_impact": "A buffer overflow flaw exists in the fromaddressNat handler of the Tenda F456 router, specifically the /goform/addressNat endpoint. By supplying a crafted menufacturer/Go argument, an attacker can overflow internal buffers, potentially overwriting return addresses and executing arbitrary code. The vulnerability is exploitable from outside the local network, allowing an attacker to compromise the router without local access.", "risk_and_exploitability": "The CVSS score of 8.7 indicates high impact, and the EPSS score of less than 1% suggests low likelihood of existing widespread exploitation at present; however, the flaw is publicly documented and a proof\u2011of\u2011concept is available. Because the vulnerability is remotely exploitable and can lead to arbitrary code execution, a successful attack would give an adversary full control over the device. The flaw is not yet listed in CISA\u2019s KEV catalog, but its severity warrants immediate attention."}}}}, "created": "2026-04-27T18:41:59.096820+00:00", "updated": "2026-04-28T05:30:23.351605+00:00", "vendors": ["tenda", "tenda$PRODUCT$f456"]}