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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": "2026-04-28T05:06:35.467617+00:00", "value": {"mitigation_remediation": ["Upgrade to the latest firmware that contains the fix for the PPTPDClient buffer overflow.", "If an update is unavailable, disable the PPTPDClient service or block HTTP access to /goform/PPTPDClient via firewall rules.", "Restrict administrative access to the web interface to trusted internal networks only, and enforce strong authentication."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "Tenda F456 1.0.0.5 is affected. Users running this firmware version should be aware that the buffer overflow can be triggered via remote HTTP requests to /goform/PPTPDClient.", "description_and_impact": "The vulnerability arises from a buffer overflow in the fromPptpUserAdd function of the httpd component on Tenda F456. Manipulating the opttype/username argument can overwrite memory and grant an attacker arbitrary code execution. This flaw is a classic stack-based overflow (CWE\u2011119), which can compromise confidentiality, integrity, and availability of the device and potentially the networks it connects.", "risk_and_exploitability": "The CVSS score of 8.7 reflects a high\u2011severity remote exploitation possibility. The EPSS score is below 1%, indicating a low current exploitation probability, and the vulnerability is not yet listed in the CISA KEV catalog. However, public exploit code is available, so the risk remains high. Attackers likely exploit the flaw by sending crafted requests to the device\u2019s web interface, leveraging the buffer overflow to achieve remote code execution."}}}}, "created": "2026-04-27T18:41:59.092596+00:00", "updated": "2026-04-28T05:15:22.938378+00:00", "vendors": ["tenda", "tenda$PRODUCT$f456"]}